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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.
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:
21 sie 2024 · The IF-THEN statement in SQL is used to execute a block of code if a specified condition is true. If the condition evaluates to true, the code within the THEN block is executed. If the condition is false, the block is skipped. Syntax: IF condition THEN. statements; END IF; Parameters Used:
Use IF...THEN...ELSEIF...ELSE statement to evaluate multiple conditions sequentially and execute corresponding blocks of statements based on the first true condition, with an optional block of statements to execute if none of the conditions is true.
18 lut 2018 · It is possible to update rows based on some condition. It is also possible to update multiple tables in one statement in MySQL. Whether the latter is a good idea is debatable, though.
In MySQL, the IF-THEN-ELSE statement is used to execute code when a condition is TRUE, or execute different code if the condition evaluates to FALSE. Syntax. The syntax for the IF-THEN-ELSE statement in MySQL is: IF condition1 THEN. {...statements to execute when condition1 is TRUE...} [ ELSEIF condition2 THEN.
23 cze 2013 · UPDATE relation SET name1 = CASE WHEN userid1 = 3 THEN 'jack' ELSE name1 END, name2 = CASE WHEN userid2 = 3 THEN 'jack' ELSE name2 END WHERE (userid1 = 3 AND userid2 = 4) OR (userid1 = 4 AND userid2 = 3); Here is SQLFiddle demo.
