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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. 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.

  3. 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:

  4. www.baeldung.com › sql › insert-update-if-row-existsInsert Into a SQL Table or Update if the Row Exists - Baeldung

    17 paź 2024 · MySQL provides two ways to insert a row into a table or update the row if it already exists. We can use the INSERT INTO … ON DUPLICATE KEY UPDATE syntax or the REPLACE statement.

  5. www.delftstack.com › howto › mysqlHow to Update Record if It Exists Else Insert It in the MySQL...

    2 lut 2024 · MySQL will send an alert if a user tries inserting a record that already exists or has a duplicate PRIMARY KEY value. This article outlines the methods that can be used to correct this mistake and get a better result.

  6. www.machinelearningplus.com › sql › how-to-insert-into-a-table-or-update-if-existsHow to insert into a table or update if exists in MySQL?

    You can use the INSERT INTO …. ON DUPLICATE KEY UPDATE statement in MySQL to achieve this. This statement will insert a new row into the table, or if a duplicate key violation occurs (i.e., a row with the same primary or unique key exists), it will update the existing row with the new values. Here’s the SQL query:

  7. stackoverflow.com › questions › 42594238UPDATE based on if value exist in another table

    4 mar 2017 · You can use directly SELECT FROM table1 and update into table2 : UPDATE table2 SET Another = 'ZZZ' FROM table1 t1 WHERE t1.Number = table2.Number

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