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IF Statement
IF search_condition THEN statement(s) [ELSEIF search_condition THEN statement(s)] ... [ELSE statement(s)] END IF |
IF implements a basic conditional construct. If the
search_condition evaluates to true, the corresponding SQL statement is
executed. If no search_condition matches, the statement in the
ELSE clause is executed.
Please note that there is also an IF() function.
See section 12.1.4 Control Flow Functions.