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1 lut 2010 · update table set a = if(a > 0 and a < 1, 1, if(a > 1 and a < 2, 2, a)) where a is not null; you might want to use CEIL() if A is always a floating point value > 0 and <= 2 Share
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; or a CASE expression: UPDATE my_table SET comments = CASE WHEN comments>3 THEN comments-3 ELSE 0 END WHERE something = 123;
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.
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:
Set the column equal to itself with an isnull round it setting it to your parameter. UPDATE YourTable SET YourColumn = ISNULL(YourColumn, @yourParameter) WHERE ID = @id
The IF statement can have THEN, ELSE, and ELSEIF clauses, and it is terminated with END IF. If a given search_condition evaluates to true, the corresponding THEN or ELSEIF clause statement_list executes. If no search_condition matches, the ELSE clause statement_list executes.
11 lip 2024 · The IF () function in MySQL is a powerful tool that allows you to implement conditional logic directly within your SQL queries. It takes three parameters: a condition to evaluate, a value to return if the condition is true, and a value to return if the condition is false.
