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Additionally, you could handle when the condition is null. In the case of a null amount: SELECT id, IF (type = 'P', IFNULL (amount,0), IFNULL (amount,0) * -1) as amount FROM report. The part IFNULL (amount,0) means when amount is not null return amount else return 0. edited Mar 30, 2023 at 14:14.
Definition and Usage. The IF () function returns a value if a condition is TRUE, or another value if a condition is FALSE. Syntax. IF (condition, value_if_true, value_if_false) Parameter Values. Technical Details. Works in: From MySQL 4.0. More Examples. Example. Return 5 if the condition is TRUE, or 10 if the condition is FALSE:
22 lut 2012 · select if(name, 1, 0) .. Even if 'name' is not NULL, unlike in C, a false-condition still triggers and the above statement returns 0. Thus, you have to remember to explicitly check for NULL or empty string: select if(name is null or name = '', 0, 1)
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.
The IF statement allows you to evaluate one or more conditions and execute the corresponding code block if the condition is true. The IF statement has three forms: IF...THEN statement: Evaluate one condition and execute a code block if the condition is true.
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.
MySQL IF function is one of the MySQL control flow functions that returns a value based on a condition. The IF function is sometimes referred to as IF ELSE or IF THEN ELSE function. The syntax of the MySQL IF function is as follows: IF(expr,if_true_expr,if_false_expr) Code language: SQL (Structured Query Language) (sql)
