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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. dba.stackexchange.com › questions › 285380Set column values based on condition statement

    14 lut 2021 · The updated column is boolean so you should output TRUE or FALSE (it will work with 1s and 0s but there is no better than your code being clear). In your case: UPDATE smartcardtable SET service_direction = CASE WHEN board_stage < alight_stage THEN TRUE ELSE FALSE END ;

  3. dev.mysql.com › doc › enMySQL :: 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.

  4. 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.

  5. www.mysqltutorial.org › mysql-stored-procedure › mysql-if-statementMySQL IF Statement - MySQL Tutorial

    Summary. Use IF...THEN statement to conditionally execute a block of statements based on the evaluation of a specified condition. Use IF...THEN...ELSE statement to execute a block of statements if a specified condition is true and an alternative block of statements if the condition is false.

  6. stackoverflow.com › questions › 12754470MySQL update CASE WHEN/THEN/ELSE - Stack Overflow

    6 paź 2012 · UPDATE `table` SET uid = ELT(FIELD(id, 10, 20, 30), 2952, 4925, 1592) WHERE id IN (10, 20, 30) As FIELD() returns the index (position) of str in the str1, str2, str3, ... list. Returns 0 if str is not found.

  7. www.freecodecamp.org › news › sql-update-statement-example-queries-for-updatingSQL Update Statement — Example Queries for Updating Table Values

    26 kwi 2020 · The UPDATE statement can be used to update a single column, a larger set of records (through the use of conditions), and/or the entire table in a database. The condition(s) can be a boolean, a string check, or mathematical sequence that resolves to a boolean (greater than, less than, etc.).

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