if(boolean condition, type valueTrue, type valueFalseOrNull)
Returns valueTrue when condition is true, returns valueFalseOrNull otherwise.
The return type is the type of the result of the valueTrue/valueFalseOrNull expression
mysql> select user_id, if(user_id = 1, "true", "false") test_if from test; +---------+---------+ | user_id | test_if | +---------+---------+ | 1 | true | | 2 | false | +---------+---------+
IF