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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. More Examples. Example. Return 5 if the condition is TRUE, or 10 if the condition is FALSE: SELECT IF(500<1000, 5, 10);
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)
8 sty 2021 · TRUE and FALSE are not necessarily equivalent with 1 and 0. For one, they behave very differently when used in combination with the IS operator. For example, WHERE NOT(something IS 1) would be a syntax error, but WHERE NOT(something IS TRUE) works.
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.
In SQL, all logical operators evaluate to TRUE, FALSE, or NULL (UNKNOWN). In MySQL, these are implemented as 1 (TRUE), 0 (FALSE), and NULL. Most of this is common to different SQL database servers, although some servers may return any nonzero value for TRUE.
The IF statement for stored programs implements a basic conditional construct. Note. There is also an IF() function, which differs from the IF statement described here. See Section 14.5, “Flow Control Functions”. The IF statement can have THEN, ELSE, and ELSEIF clauses, and it is terminated with END IF.
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.
