LEAVE（退出）
语法结构
LEAVE label
说明描述
该语法用来退出循环或者结构。经常用在BEGIN ... END或者LOOP, REPEAT, WHILE中。在存储过程，Triggers and Events，LEAVE can refer to the outmost BEGIN ... END construct。 Stored Functions, RETURN 可以用来替换leave语法。
注意：leave 不能用来退出DECLARE HANDLER。
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