Write a sql query to fetch only odd rows from table in mysql. SELECT UserName, InsertTime FROM tblaccounts WHERE .

Write a sql query to fetch only odd rows from table in mysql To change the collation of the any column for any table permanently run following query. Finding duplicate rows in SQL tables is a crucial skill for maintaining data integrity. This syntax will find rows where our target column has odd values: SELECT * FROM table_name where column_name % 2 > 0; Some Examples. SELECT * FROM msgtable WHERE cdate = '2012-07-18' ORDER BY msgtable_id-- or whatever is stable LIMIT 10 OFFSET 50; -- to skip to page 6 Use standard-conforming date style (ISO As an aside, for paging problems, I often write the query seek down a key to find the one page of keys for display, and then 'look up' the row data from those keys. The UPPER() function is used to perform the conversion. How do I write an SQL query to count the total number of a specific num value in the num column of a table? Assuming we have the following data. Probably the most efficient route would be to incorporate the two WHERE clauses into one. SQL employee Database: Exercise-31 with Solution [An editor is available at the bottom of the page to write and execute the scripts. SELECT COUNT(Department) FROM Employee Does anyone have any advise on how I can improve this query? ****Edit MySQL INFORMATION_SCHEMA. But the problem I am facing is the tables, views, stored procedures and functions are keep on fetching. Query a list of CITY names from STATION with even ID numbers only. name, employee. columns where table_schema = 'computers' and table_name='laptop' and column_name not in ('code') order by ordinal_position; It should be mentioned that the information schema in MySQL covers all database server, not certain databases. So, the value of i will have no meaning whatsoever. g. ID IN ( SELECT TOP 1 e2. I just today installed MYSQL on my Windows 10 computer for my personal learning. For example, in my EMP table in SCOTT schema I have 14 rows, and I want first 50 percent rows based on order by sal:. Now I want to have all those records which are in A but not in B. SQL interview questions and answers in Hindi. But you need a stable ORDER BY clause, or the values may be ordered differently for the next call (after any write on the table for instance). 2013(Saturday) and how get records on date 18. month, and year records in MySQL. Hopefully this helps someone. com/watch?v=fmzrXNO9q9g&list=PL-dwj4UAzfFultB23iPa9sIL1aM1JuHMhWrite a query to fetch only odd Make a query B that gets you the rows that you want to keep; Make a query that deletes all rows that are in A but not in B. ID FROM events e2 WHERE e2. Train_Number, d. Schema structure for STATION: ID Number CITY varchar STATE varchar select CITY from STATION Here are SQL queries to find even and odd records from a table. For example in SQL Server you can write the dynamic query like following. SQL Query to Fetch Even and Odd Records. WHERE name REGEXP '^[aeiou]. How can I SELECT rows There are no other columns with numbers in them. Improve this question. If I can do this using the SQL tools? And If I wana select >= 5 records (more Hi Guys As part of SQL Interview Question Series I have explained below question. How can we fetch alternate odd numbered records from MySQL table? MySQL query to You have to substitute N in the query with a number of rows in the table. It does not work on postgres 12 at least. Train_Number AND b. Follow edited Feb 8, 2015 at 19:15. SQL QUERY TABLE IMAGE SQL query to find even and odd records from any table. In the outer query, reference the alias rn and use the mod function to get odd rows or even rows. Using user variables in a single query: Very late to this thread, but I had a similar situation and the following worked on MySQL. com Is it possible using mysql and php to select only the rows from the field hostname where When I send a query to my SQL database and it returns more than one row, how can I fetch each row individually? I tried to use mysql_result(), but this function only returns one field. If you want to create a list of the column names, you Explanation: In this example, the query assigns a sequential number to each row based on the Employee_ID column. For eg. . Explanation: The subquery SELECT Name, COUNT(Name) AS num FROM Person GROUP BY Name creates a temporary table with the count of each Name. The loop stops and continues to the next For MySQL versions prior to 8. 2013(Sunday) ? I am new in codeigniter and just stacked in a query to solve a report for an emergency project. I'm doing this by running a create table on the main table (32Million) records with a join on another table that's about 5k records. NAME FROM sys. ; The WHERE clause then filters for the record with the 8th row number, effectively retrieving the 8th IMO, the best seems to use sql statements only to copy that row, while at the same time only referencing the columns you must and want to change. I believe you can only use the USING syntax for the join if the groups_fans table has a key column with the same name, which it probably does not. Calling the class' query method will query and cache the entire set of results at the first time; afterward, each subsequence query will retrieve only the updated portion, and will merge the result into the cache. As per my current application design, if a record is present in A then it should be present in table B as well. * Write a SQL query to fetch only the odd rows from the table. This query below performed at least 5* better than the other queries proposed: -- Count SELECT count(*) FROM ( (SELECT id FROM table1) EXCEPT (SELECT id FROM table2) ) t1_not_in_t2; -- Get full row SELECT table1. mysql_query ("SELECT * FROM Try only this:- SELECT * FROM reset ORDER BY ASC LIMIT (FOUND_ROWS() - 3), 3 and check if it is giving the last 3 rows from For an Employee table with columns EmpId, Name and Salary Table with columns Id, EmpId, Salary, where EmpId of salary table is Foreign Key of Employee Table. For the purpose of demonstration, we will be creating an Employee table in a To select 50% from the table: select * from mytable fetch first 50 percent rows only; This selects 50% of the table's rows arbitrarily. The required query is: mysql interview queries playlist:https://www. In my test, this won't use an index on the name column, so it will need to perform a full scan, as :1) In the string column i write for ex. MySQL query to find the nth highest salary: Query You can use union all to duplicate each and every row in the resultset:. I am fairly new to MYSQL. EDIT: A comment was made that at 1000 records indexs are not relevant. Select EVEN How to write SQL query to find max and min salary along with employee name in Oracle. 11. ALTER TABLE Table1 ALTER COLUMN Column1 VARCHAR(20) COLLATE Latin1_General_CS_AS To know the collation of the column for any table run following Stored Yes, indeed. id. The required query is: Query #26. At present it is returning all the rows of the above fulfilled condition. * from emp e ) where r = 3 ; and it works well . Then just do MINUS on the original table from this table: SELECT col_id FROM table MINUS SELECT col_id FROM table_a. Let's say you wanted to query . How i get the results?I mean ,if i try "cout<<sql"it gives me an address. So instead, try this: LEFT JOIN groups_fans AS m ON m. I want to do 2 things: fetch all cars that are avaiable in blue. 0. However for this answer is not about MySQL syntax but about the way you can do this. Whatever way I thought, or my SQL knowledge ;) I got either only row having assigned_to=7, or nothing if assigned_to=X[x=other assigned users and other other foreign_ids] isn't present in table. I have tried to create one(new) table with the same structure as my existing table. Train_Number = b. And to get only size of your tables (not system tables): WHERE table_schema = @tableSchema AND TABLE_TYPE = 'BASE MySQL query for finding rows that are in one table but not another. But that's a whole lot of ugly SQL, and its horrendously inefficient, creating and populating temporary MyISAM tables anytime a query ORDER BY num DESC OFFSET 20 ROWS FETCH FIRST 10 ROWS ONLY Will skip the first 20 rows, and then fetch 10 rows. Assuming a table named table, with an autoincrement ID column named id and a column named name of which you want to remove the doubles. Follow answered May Mysqladmin can do the job of saving out the create table script. Commented Jul 25, Commented Mar 4, 2024 at 9:40. SELECT aa. How to select values which are not present in another table? Hot Network Questions Can one appeal to helpfulness when asking a tween to do chores? Grounding a 50 The table is of moderate size, currently ~600k row and growing by ~2k everyday. SELECT * FROM `table` WHERE (`timestamp` > DATE_SUB(now(), INTERVAL 1 DAY)); But this takes results for the last 24 hours, and I need it to only select results from today, ignoring the time. Modified 2 years, Then, it subqueries only once to retrieve the full matching records. Table of contents. Schema structure for STATION: ID Number CITY varchar STATE varchar select CITY from STATION as st where st. mysql_fetch_array just returns the next row of the result and advances the internal pointer. I am assuming employee_id in ascending order here. So my table is Cars and each row has only 2 fields. append(k[0]) db. This should be the only correct solution. I say efficient in the sense of "Do it that way if you're going to run this query in a regular report or production application. I have a SELECT query SELECT FROM friendzone I am using sql query to fetch rows from table. mysql; sql; or ask your own question. To find and return the records with the odd or even values, the most simple way is to check the remainder when we divide the column value by 2. id IS NULL This will return the extra id-s that are missing in your Phone_book table. "halftime" and in "name" i write "I". name = 'security' But I wanna select only 5 records. How can we fetch all the records from a particular MySQL table - We can fetch all the record from a MySQL table by using SELECT * from table_name; query. Without that, your answer has much less educational value - remember that you are answering the question for readers in the future, not just the person asking now! You can find more information on how to write good answers in the help center. id FROM tableA LEFT OUTER JOIN tableB -- people are the same if fullname and adress That would work great but only for quick queries. 1 and later (following standard ANSI SQL) select * from table order by some_column offset x rows fetch first y rows only They may meet your needs more or less. select custname, city from mytable union all select custname, city from mytable An order by clause might be useful:. 919. The efficient way to find the record belongs to even or odd is determining by the table’s ID column. For the second one: this time you are only using one row of the result set and you are doing something for each of the columns. Employee where BusinessEntityID % 2 = 0--To fetch Here, we are going to see how to display the last 50% of records from an Employee Table in MySQL and MS SQL server's databases. Supposing the numbers always come in pairs,an inner join is suffice. Along with the data columns, select the pseudocolumn rownum with an alias, say rn. * from emp e ) where rownum = 3 ; i'm getting my output : no data found Write an SQL query to fetch “FIRST_NAME” from the Worker table using the alias name <WORKER_NAME>. I want to get each data from each table column and put into a variable. SQL> SELECT empno, sal FROM emp 2 ORDER BY sal 3 FETCH FIRST 50 PERCENT ROWS ONLY; EMPNO SAL ----- ----- 7369 The header contains contact information about the employee, one row per employee, each employee with an id - the primary key. You can know in advance how many results there are by using mysql_num_rows(). * FROM stories AS story LEFT JOIN lines AS line ON lines. SELECT a. SELECT * FROM TABLE WHERE EMAIL IN (SELECT * table A columna ----- A B C : : Z Here is how to select even rows. tables t ON --To fetch ALTERNATE records from a table (EVEN NUMBERED) Select * from TableName where ColumnName % 2 = 0 For Eg : select * from HumanResources. SELECT col_id FROM table WHERE rownum > (SELECT count(col_id)/2 FROM table); So if you want the other half of the table, you could just store the first results into a temp table, lets call it TABLE_A. Now using high leval insert i want to insert M to odd rows and F to even rows. Train_Number INNER JOIN traindaystb e ON You can use a select on your group by query and then join it with the course table to use the rest of its fields. Hence, auto-increment columns like those of a primary key make perfect candidates. 2) I don't want the user to enter "column". Train_Name, GROUP_CONCAT(e. From the following table, write a SQL query to identify the employees whose salaries I can extract odd or even rows by putting where condition Id % 2 = 0. Commented Feb 24, 2019 at 2:05. SELECT product_id, Count(product_id) AS cnt FROM warehouse GROUP BY product_id; This query returns the count of each value, but how can I edit it to only return rows with odd cnt? sql; ms-access; select; Share. youtube. – I am trying to convert a Db2 query to SQL Server, I came across a construct I am not familiar with: FETCH FIRST 1 ROWS ONLY. 2013(Sunday) ? let's say you want to get all records from table users, then you do: SELECT * FROM users; Now let's assume you want to select all records from table users, but you're interested only in the fields id, firstname and lastname, Write an SQL query to fetch only odd rows from the table. description is a sequence of 7-item sequences of the form (<name>, <type_code>, <display_size>, <internal_size>, <precision>, <scale>, <null_ok>), one for each column, as described here. Example. name FROM employee INNER JOIN deparment ON employee. ". Let's give each of the above statements a try against the orders table of the I just want my query to return every odd rows, i. select 3 rows from mysql table, then get each row's specific The following query will give you all the ids of people in tableA that are not in tableB based on full name and adress: SELECT tableA. In the following scenario, the result should be only the row with TemplateID = 2. The first one "Car_Brand" is a simple string field. How to fetch the first two rows from Mysql DB using Mysql PHP function? Is there any function which can give me first 2 or 3 rows from the select query we fired? Fire a query to select only the necessary number of rows using LIMIT clause. how to select data Now I need an SQL query to return 10, 30 product_ids which have odd count in the table. To avoid errors when you have views stored in your database, the WHERE clause should look like that: WHERE table_schema = @tableSchema AND TABLE_TYPE != 'VIEW'. select custname, city from mytable union all select I am not sure if the accepted answer works. *[aeiou]$' ^ and $ anchor the match to the beginning and end of the value. series where. Pictorial Presentation of the above query. Result: MySQL Code Editor: Have another Using a self join you can do this, assuming that the Time is really a time field. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company write a SQL query to retrieve third row from the table ,Let 's say table name is emp Actually i want to understand rownum concept . I want to select the rows only with distinct values and if there is no value entered for some row, that row should not be there. Along with the data columns, Query a list of CITY names from STATION with even ID numbers only. mysql LIMIT limit OFFSET offset will work. a query you have written up until this point. select d. 8. Fetch record from 1st table which are not in 2nd table mysql. SELECT * FROM EmployeeDetails WHERE MOD (EmpId, 2) <> 0; -- 35. I tried it in PHPMyadmin in raw coding and it's worked for me. Of each name, you want to keep the oldest record (the one with the lowest ID I was asked to design a class for caching SQL query results. How can I select results based on the date only ? - Both main and sub query reference the same table - The query engine scans through the Index for every unique Student_ID - The sub query is executed, for that Student_ID - The query engine is already in that part of the index - So a new Index Lookup is not needed . Case 1: Write a query to find even records in MYSQL. SQL is not supposed to be used like this. That's what the foreach language If your're interested in all columns from events table, not just the above two columns I choose, there's a freaky implementation in some databases (e. What I want: to make a single sql call and get the entire list of players so I can populate an object or list of objects. So, basically, it means that every row returned in the result will be unique in terms of the combination of the select query columns. 0 compliant clients, cursor. Best way to fetch the Odd and Even Rows in SQL Table is done by using RowNumber, Declare @Emp2 Table (empno INT, empname VARCHAR(10), empsalary INT) INSERT INTO Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company How can we fetch a particular row as output from a MySQL table? How to fetch the newly added records from a MySQL table? How can we fetch one or more columns as output from a MySQL table? How can we fetch a second highest salary of an employee from a MySQL table? Fetch unique records from table in SAP ABAP; How can we display all the records I assume your problem is that 0 rows are returned from the cursor. Q-26. SQL Server) which may help you: SELECT * FROM events e1 WHERE e1. – Igor. How to write and SQL Query for the same. 10. total_registrations AS total_fees FROM course AS aa LEFT JOIN ( SELECT course_id, COUNT(*) as total_registrations FROM registration GROUP BY course_id ) AS _aa ON aa. story_id = story. seriesKey ORDER BY e2. The required query is: Write an SQL query to determine the nth (say n=5) highest salary from a table. But I'm not sure how to put 'O' or 'E' in the new column. Getting total rows in a query result You could just iterate the result and count them. Ask Question Asked 8 years, 11 months ago. What I have tried so far: In this case, we want to order ascending (the default order in MySQL) by the started_date from the lines table, while retaining only a single record, corresponding to the first as you defined it. The Overflow Blog Knowledge-as-a-service: The future of community business models How can I write MySQL query that filters even and odd number from a a single column and Also, please refrain from drastically rewriting a question as to make it entirely different. Once you added auto increment key that will be useful in most use cases. I want to do a single SELECT query that returns the latest 3 records (ordered by Date timestamp) for each ID. However, it is not a design flaw, in my opinion. Thanks Here are SQL queries to find even and odd records from a table. fetch all cars that are available in blue and green. Is it possible to write a SQL query so that the result contains each employee's name and the salary of all employees provided by a employee name? Sample Data. Or replace group_id with whatever the appropriate column name is in the groups I need to write a query that will return the third highest salaried employee in the company. The second implicit temporary table contains all way2: But it's better to add auto increment key for tables like t2. Days) FROM scheduletb a INNER JOIN scheduletb b ON a. Add a comment | 7 . MySQL query to copy records from one table to another with different columns; A single MySQL query to insert records (not all) in the second table from the first table; MySQL query to select records from a table on the basis of a particular month number? MySQL query to find a match and fetch records; MySQL query to return 5 random records from MySQL doesn't support EXCEPT (to my knowledge). 0 and created some tables in the database. course_id, aa. select * from ( select rownum , e. ID Name typeId 1 test1 1 2 test2 1 3 test3 2 If I am going to fetch data with type id 1 I need a result like this. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog Oracle 12. course_id = I am new to Sql query if I had a table called Employee: Id, Name, Department 1 tim sales 2 tom sales 3 jay HR 4 ben design 5 lin design I am trying to write a query that returns the number of employees in each department. (Should be optional according to the As i understand your question is that you need to run the queries which are stored in table column in SQL Form. Write an SQL query to create a new table with data and structure copied from another table. You don't say what language or client library you are using, but the API does provide a mysql_num_rows function which can tell you the number of rows in a result. Modified 8 years, 11 months ago. If your query is doing a table scan, it will obviously take a long time. Employee Table Yeah, I was facing the same But finally I tried the following mysql query it worked and saved me. This would be tricky if you want to make sure you're getting data precisely. columns c JOIN sys. select COLUMNNAME from TABLENAME where ROWELEMENT="SOME_VALUE"; This should be your sql query. Mysql Query to find third highest salary in company. Note that if you use DATE(date) = CURDATE() you will run a date conversion for every row in the table, which will be really bad for your perfomance if you have many rows and/or you need to I'm assuming mysql_fetch_array() perfroms a loop, so I'm interested in if using a while() in conjunction with it, if it saves a nested loop. course_name, aa. select group_concat(column_name) from information_schema. SELECT DISTINCT meta_value FROM `wp_postmeta` WHERE meta_key = "aaa"; This is the query I am using, I am getting the distinct rows by this query but also getting the I have a database, in one of the fields occasionally I get an entry which starts off as mail. surname, department. 9. id FROM Call LEFT OUTER JOIN Phone_book USING (id) WHERE Phone_book. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Your groups_main table has a key column named id. Welcome to Stack Overflow! Whilst this code snippet is welcome, and may provide some help, it would be greatly improved if it included an explanation of how it addresses the question. Train_Number = d. When you say even numbered rows, there must be some order for numbering. Ideally, its data should be numeric, unique, and sorted in ascending order. For each given ID, the Date values are always unique, so no need to worry about ties for Date here. *, line. Each row references the employee's id from the header table. eventStart ); Possible Duplicate: mysql_fetch_array() expects parameter 1 to be resource, boolean given in select simple question here. select Max(payment) from wallets where payment < (select Max(payment) from wallets where payment < (select Max(payment) from wallets)); ( SQL: Fetch rows based on even, odd values from multiple tables. Once i try this . MySQL query to find the nth highest salary: Query Use a regular expression. Time > a. id_department=department. let's say get only less than 10 or more then 25, you can use HAVING operator, like GROUP BY HAVING COUNT(*) > – BotanMan. The details table contains multiple rows per employee, each representing a record of a training-type achieved by the employee. id=2 ORDER BY lines. Ask Question Asked 6 years ago. Write a SQL query to fetch only odd rows from table. ] 31. At the last row the function mysql_fetch_assoc will move and see there is no result and it will return false. Here you can fetch the queries form table column and execute them in mysqli. The 2nd option is preferable. The following query will also return all the rows that match the condition of duplicate emails. rollback() Only then, try the less-obvious LEFT OUTER JOIN, see if its performance is better. Look at the query execution plan. I have a large database table and wants to show only Odd/Even Data rows from that table which will filtered by a table Field named is "sale_id". WHERE id IN(SELECT id FROM EMPLOYEE WHERE id%2 = 0); Output/Result. The second field is a multiple-valued field generated with multiple-select input. I want to just enter "I" and the program gets (uses)the halftime for example. 0, we can emulate row number using user variables. this is my table. It would probably be easier to select the unique ones into a new table, drop the old table, then rename the temp table to replace it. SELECT story. Here, the table name - Employee &Primary column name - Emp_IdSELECT *FROM EmployeeWHERE Emp_Id % I use this query to show results from MySQL: SELECT * FROM `table` ORDER BY id ASC But I want to show only the last 100 rows. Supported by newer versions of Oracle, PostgreSQL, MS SQL Server, Mimer SQL, MariaDB and DB2 etc. Try this: SELECT * FROM table WHERE date > CURDATE(); CURDATE() will return the current date as 2011-10-07 which will be cast to 2011-10-07 00:00:00 when comparing datetimes to it. Note description will be None if the result of the execute statement is empty. For example, if I have a script that runs every hour, I can't just say get me the last hour data because the script might have slight variations in the time when it starts. I need to find out only those rows for which there is a special character in “Body” column. fee * _aa. Run. select * from <table_name> where date_created >= DATE_ADD(NOW(), INTERVAL -30 DAY); Share. ; The outer query filters rows where num > 1, returning duplicate names. SELECT UserName, InsertTime FROM tblaccounts WHERE The above result set can be achieved by the following code - SELECT Even, Odd FROM (SELECT *, ROW_NUMBER()OVER(ORDER BY Even) AS ROW FROM (SELECT CASE WHEN ID % 2 = 0 THEN Names ELSE NULL END AS 'Even' FROM TableName)TAB1 WHERE Even IS NOT NULL)T1 FULL OUTER JOIN (SELECT *, ROW_NUMBER()OVER(ORDER BY Since my final data query will be large, I'm trying limit the number of rows I have to work with initially. The query execution plan can help you decide what kind of indexing you would need on the table. Ans. Last Week. 5) using two tables with ~2M rows each. – Community Bot. Select * from (select rownum r ,e. commit() except: db. Otherwise, you may need to write a su Very Easier way to find SQL query to even or odd number of rows values from a table. department group by department having count(*)<6 order by sum Write an SQL query to fetch duplicate records from EmployeeDetails. For example a user likes a post, a row is added to the table, then user dislikes and likes again, then a new row is added again, I want only the new row only. Step 1, create a table, insert some rows: create table penguins (id int primary key, myval varchar(50)) insert into penguins values(2, 'werrhhrrhrh') insert into In this article, we will learn to Select only EVEN or ODD records from the MS SQL Server database table🤔. When the remainder is 0, that’s an even number, otherwise, that’s an odd I want to select the last 3 rows of an sql table. DISTINCT keyword is supposed to be applied to all the columns in the select query and not just to the column next to which DISTINCT keyword is written. by which column order to give preference to one row over another. id=e. started_date LIMIT 1 Tell me please, is exist a shorter algorithm (preferably in the query MySQL)? ADD Question is: Why this query select record on date 17. I have Tried. WITH cte AS ( SELECT NAME, SALARY, RANK() OVER (ORDER BY SALARY) rnk_min, RANK() OVER (ORDER BY SALARY DESC) rnk_max FROM In DB-API 2. This can be achieved by using Row_number in SQL server-SELECT E, E, E FROM ( SELECT *, Row_Number() OVER(ORDER BY EmpId) AS RowNumber FROM I've decided to build a website for fantasy football for my family but am getting stuck with returning multiple rows from the database. How can I make it? I tried this: SELECT * FROM `table` ORDER BY id Amateur question, but something I've been wondering about. salary) as total_salary from Employee e inner join Department d on d. – ToolmakerSteve. group_id = g. SELECT * from your_table_name WHERE field_name IS NULL; Go ahead with this query it will select only the rows which are empty. This will allow editors like Notepad++ or NetBeans to highlight the HTML code too. Please help me Codeigniter's Experts. I am able to insert to ( new ) the table only male or female but not to the even or odd rows Is there a way to retrieve SQL result column value using column name instead of column index in Python? #query execution cursor. Mureinik. Improve this answer. In order to fetch all the rows with an even column value, run: SELECT * FROM my_table WHERE my_column % 2 = 0; Otherwise, if you want to fetch all the rows with an odd column value, Once the order is specified, then the query to retrieve odd rows or even rows can be written in this form: Write a subquery with an ORDER BY clause. Commented Dec 2, This will only work for tables having column "number" or "id" something. select * from student group by place having age>18 and count(*) = 1; This query groups by place, checks age and return records for which there is When I send a query to my SQL database and it returns more than one row, how can I fetch each row individually? I tried to use mysql_result(), but this function only returns one field. You will need to access the value of that element using SELECT col_id FROM table WHERE rownum > (SELECT count(col_id)/2 FROM table); So if you want the other half of the table, you could just store the first results into a temp table, lets call it TABLE_A. row number 1,3,5 so on. DECLARE @selstmt AS NVARCHAR(max); SET @selstmt = 'select ' + Stuff((SELECT ', ' + Quotename(NAME) FROM ( SELECT c. SQL - SELECT rows NOT EXISTS in another table. But due to some interfacing issues, not all records of table A are present table B. Related. Whether using basic GROUP BY and ORDER BY num DESC OFFSET 20 ROWS FETCH FIRST 10 ROWS ONLY Will skip the first 20 rows, and then fetch 10 rows. Add a comment | 0 . This is the query working on db2: select * from products. Write an SQL query to determine the nth (say n=5) highest salary from a table. Use a regular expression. One more way to do this in: MYSQL. Also, creating table partitions can help sometimes in cases where the data is partitioned by a condition (usually date and time). I know I should use SELECT * FROM table ORDER BY DESC LIMIT 3, but the problem with this code is that it selects the rows from the end. Note that with SQL Server, you must always specify OFFSET when using FETCH FIRST. And as i sad it is possible to get this in one query using prepared queries. If you are on Oracle 12c, you could use the Top-n row limiting feature which allows to limit by percentage of rows. S : I guess INNER JOIN on each of the columns will not be a good idea. SELECT DISTINCT Call. 1. Write an SQL query to show only odd rows from a table. As you've edited the question to mention So, that query gets us a rowset like would be returned from the product_keyword table I gave as an example above. e. id % 2 = 0 Will fetch the even set of records In order to fetch the odd records with Id as odd number. Name count test1 2 Show us your attempt ie. 2 . Mysql count rows and rows with null. So a the end query should look like SELECT * FROM table LIMIT 10 OFFSET 1579-10 or something like that. You have basically invalidated a set of previously given answers and wasted a great deal of time. Assuming your page size is 20 record, and you wanna get page number 2, here is how you would do it: SQL Server, Oracle: SELECT * -- <-- pick any columns here from your table, if you wanna exclude the RowNumber FROM (SELECT ROW_NUMBER OVER(ORDER BY ID DESC) RowNumber, * FROM Reflow WHERE ReflowProcessID = somenumber) t WHERE For the first one: your program will go through the loop once for every row in the result set returned by the query. (Should be optional according to the Write an SQL query to show only odd rows from a table. 2013(Sunday) - 23. I've written a query like this select * from (select row_number()over(order by no asc ) as Skip to main content I have a sql select: SELECT employee. These were tested in the Oracle database since it is popular in software applications. mysql; sql; database; datetime; Share. No. create table CopyTable select * from employeedetails; -- To create a whole table Oracle 12. I want to write one mysql query to fetch all my table data and with total records count. domainname. It doesn't loop. execute(sql) #fetch all rows rs = cursor. I made indexes on the columns where the JOIN is taking place, but not on the other where conditions. I ran some tests (on postgres 9. for example This increments the value of i variable for each row fetched (could be any row as there is no order provided here). The column TABLE_TYPE defines whether this is record for table or view (for tables Default Collation of the SQL Server installation SQL_Latin1_General_CP1_CI_AS is not case sensitive. Write an SQL query to fetch only odd rows from the table. For example:-- Query 1 SELECT * FROM table WHERE `someDate`>'2016-01-01' -- Query 2 Can any one please help with a SQL query which will fetch the common rows from these two tables? (Assume T1 and T2 has 100 columns each) P. fetchall() #iterate through rows for i in rs: #converting set to list k=list(i) #taking the first element from the list and append it to the list l. Tell me please, is exist a shorter algorithm (preferably in the query MySQL)? ADD Question is: Why this query select record on date 17. Write down the SQL Query to fetch 50% rows from total records?github link fo Once the order is specified, then the query to retrieve odd rows or even rows can be written in this form: Write a subquery with an ORDER BY clause. In the example queries, references to the product_keyword table could be replaced with this query. Besided, you got that line of HTML only once, so it will be easier to maintain. Write a query to find the 3rd highest salary from a table without top or limit keyword. Share. What is the PHP for selecting one row from a MySQL query? AKA you're picking something by unique ID (you know there's only one row that matches your request) and want to get only that value. Please give a MySQL query for fetching requirements. ; Conclusion. Currently I use. There is no direct way to do what you want by SQL. Time INNER JOIN traindetailtb d ON a. 2013(Monday) - 24. TABLES table contains data about both tables (not temporary but permanent ones) and views. If I need 2 column values from table then the constructor should contain two parameters and so on. id WHERE department. First add auto increment key to your table t2 by using below command. If you want to have a particular half, use an ORDER BY clause to tell the DBMS how to determine the rows to return, i. After that i want to join those two statements using union operator. The loop stops and continues to the next Both MySQL and MariaDB has function SUBSTRING_INDEX(str,delim,count) that splits the string str by delimiter delim and returns before/after part of the string based on sign of count where positive returns before, negative after the delimiter. The result of my query results into a row which will match the condition. Create table to store custom autoincrement values and insert one row with initial values: CREATE TABLE autoincrement_id (id_even INT, id_odd INT); INSERT INTO autoincrement_id VALUES (0, 1); Create triggers, that will modify inserted row's id value accordingly: I am trying to select only today's records from a database table. I installed mySQL workbench 8. I want to select all entries from the past week, (week start from Sunday). Write an SQL query to fetch all the Employees who are also managers. This is exposed in PHP, for example, as the mysqli_num_rows function. Fetching rows with updated at timestamp Hi I have a table with a date field and some other information. Please like & share the video. SELECT * FROM table WHERE MOD(num, 2) = 1 ORDER BY id ASC; After fetching the final resultSet for the sql server based on where condition then only we can apply any ordering either ASC and DESC. But If have around 20 columns in my table, for the first query I need firstname and lastname so both are strings I create one constructor with two parameters as string and get that data, for next query I need state and city that comes under string. How do we write the query for this? I want only one row if there are multiple rows having same post_id, user_sender and action together and that should be the latest one. Thank you! i guess the questions says it all. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company If you like, you can shorten this code, and get the HTML out of the PHP code. The question to you is, how do you define "odd" rows? – 7. Write an SQL query to fetch duplicate records from EmployeeDetails. In my test, this won't use an index on the name column, so it will need The first temporary table comes from a selection of all the rows of the first original table the fields of which you wanna control that are NOT present in the second original table. #create a table with same schema as members CREATE TABLE tmp (); #insert the unique records INSERT INTO tmp SELECT * FROM members GROUP BY name; #swap it in RENAME TABLE members TO members_old, tmp TO I am working with SQL Server 2005. name as dept_name,count(*) as emp_number,sum(e. Case 2: Write a query to find odd Before we can speak of "even or odd rows" we have to order the rows by the column whose data we're interested in splitting. Try amending your code to include a done declaration, a continue handler declaration and a done test. Just click and read this documentation To find rows where a specified column has odd values: SELECT * FROM table_name WHERE mod(column_name,2) <> 0; In MS SQL Server , there is no MOD function and you can use %. seriesKey = e1. id WHERE story. Subscribe the Channel to ke I want to write a query to fetch records in record table A and but not in table B. As to your second question: ROWNUM is From the question, I think the result should have students with age>18 and the city should be only once in the table. I'm trying to select all rows that contain only alphanumeric characters in MySQL using: SELECT * FROM table WHERE column REGEXP '[A-Za-z0-9]'; However, it's returning all rows, regardless of the fact that they contain non-alphanumeric characters. I was trying to accomplish this with subqueries, but could not get the answer. ALTER TABLE t2 add column id int(11) key auto_increment first; Then execute the below join query: If you really want to do without typing each column name, one way is using dynamic query. This SQL query converts the values in the first_name column to uppercase. What do you mean by the "odd" (and the "even") rows in the table? Rows in a table don't come with an ordinal number: "this is the first row, this is the second; this is the third, and this is the fourth". djx gfnni rrzew ihlbrmk dxukfml jubprei mwmot bryghl ibuichq flidea