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delimiter $$ create procedure example delimiter $$ drop procedure if exists sp_nested_loop$$ create procedure sp_nested_loop(in i int, in j int, out x int, out y int, inout z int) begin declare a integer default 0; declare b integer default 0; declare c integer default 0; while a < i do while b < j do set c = c + 1; set b = b + 1; end while; set a = a + 1; set b = 0; end while; set x = a, y = c; set z = x + y + z; end $$ delimiter ; This MySQL tutorial explains how to use the IF-THEN-ELSE statement in MySQL with syntax and examples. In MySQL, the IF-THEN-ELSE statement is used to execute code when a condition is TRUE, or execute different code if the condition evaluates to FALSE. In a cursor ROW TYPE OF variable that is declared inside a loop, its data type will become known on the very first iteration and won't change on further loop iterations. The tables referenced in TYPE OF and ROW TYPE OF declarations will be checked for existence at the beginning of the stored routine call.