MySQL 5.1 Reference Manual :: 12 SQL Statement Syntax :: 12.7 MySQL Compound-Statement Syntax :: 12.7.7 RETURN Syntax
RETURN expr
The RETURN statement terminates
execution of a stored function and returns the value
expr to the function caller. There must
be at least one RETURN statement in
a stored function. There may be more than one if the function has
multiple exit points.
This statement is not used in stored procedures, triggers, or events.
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