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  1. stackoverflow.com › questions › 2177543MySQL - Using If Then Else in MySQL UPDATE or SELECT Queries

    1 lut 2010 · Here's a query to update a table based on a comparison of another table. If record is not found in tableB, it will update the "active" value to "n". If it's found, will set the value to NULL. UPDATE tableA LEFT JOIN tableB ON tableA.id = tableB.id SET active = IF(tableB.id IS NULL, 'n', NULL)"; Hope this helps someone else.

  2. dev.mysql.com › doc › refmanMySQL :: MySQL 8.0 Reference Manual :: 13.2.13 UPDATE Statement

    The WHERE clause, if given, specifies the conditions that identify which rows to update. With no WHERE clause, all rows are updated. If the ORDER BY clause is specified, the rows are updated in the order that is specified. The LIMIT clause places a limit on the number of rows that can be updated.

  3. dba.stackexchange.com › questions › 340270mysql - Conditional update - Database Administrators Stack...

    16 cze 2024 · I would like to create a conditional update on an audit table, such that if the update on the main table succeeds, then the update on the audit table is performed. Right now I have this CREATE DEFI...

  4. dirask.com › posts › MySQL-UPDATE-query-with-IF-condition-conditional-update-pOv4JDMySQL - UPDATE query with IF condition (conditional update)

    In this article, we would like to show you UPDATE query with IF condition in MySQL. Quick solution: UPDATE `table_name` SET `column_name` = IF(condition , if_true, if_false); Practical example. To show UPDATE query with IF condition, we will use the following users table:

  5. www.w3schools.com › mysql › mysql_updateMySQL UPDATE Statement - W3Schools

    The MySQL UPDATE Statement. The UPDATE statement is used to modify the existing records in a table. UPDATE Syntax. UPDATE table_name. SET column1 = value1, column2 = value2, ... WHERE condition; Note: Be careful when updating records in a table! Notice the . WHERE clause in the UPDATE statement.

  6. stackoverflow.com › questions › 1886928MySQL UPDATE using IF condition - Stack Overflow

    11 mar 2015 · IF EXISTS (SELECT id FROM user_roles WHERE user_id = 5 AND end_date IS NULL) THEN UPDATE user p JOIN user_roles ur ON p.id = ur.user_id SET ur.end_date = NOW() , p.end_date = NOW() , p.reason = "Retired" WHERE p.id = 5 AND ur.end_date IS NULL ELSE UPDATE user SET end_date = NOW() , reason = "Retired" WHERE id = 5 END IF

  7. dev.mysql.com › doc › refmanMySQL :: MySQL 8.4 Reference Manual :: 15.2.17 UPDATE Statement

    The WHERE clause, if given, specifies the conditions that identify which rows to update. With no WHERE clause, all rows are updated. If the ORDER BY clause is specified, the rows are updated in the order that is specified. The LIMIT clause places a limit on the number of rows that can be updated.

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