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29 maj 2017 · Is it possible to do UPDATE query on MySQL which updates field value only if certain condition is met? Something like this: UPDATE test. SET. CASE. WHEN true. THEN field = 1. END. WHERE id = 123. In other words, "field" would be only updated if condition is met, otherwise nothing is done.
UPDATE my_table SET comments = GREATEST(CAST(comments AS signed)-3, 0) WHERE something = 123; or the IF() function: UPDATE my_table SET comments = IF(comments>3, comments-3, 0) WHERE something = 123;
An UPDATE statement can start with a WITH clause to define common table expressions accessible within the UPDATE. See Section 15.2.20, “WITH (Common Table Expressions)”. Single-table syntax: UPDATE [LOW_PRIORITY] [IGNORE] table_reference . SET assignment_list . [WHERE where_condition] [ORDER BY ...] [LIMIT row_count] value: {expr | DEFAULT}
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.
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:
23 cze 2013 · I know I'm a little late to this, but I think an easier to read solution would be to use the IF () function in MySQL: UPDATE relation. SET name1 = IF(userid1 = 3, 'jack', name1), name2 = IF(userid2 = 3, 'jack', name2) WHERE (userid1 = 3 AND userid2 = 4) OR (userid1 = 4 AND userid2 = 3);
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. 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 ...
