一 定义：
The Oracle PL/SQL GOTO statement is a sequential control structure available in Oracle. The GOTO statement immediately transfers program control (called "branching") unconditionally to a named statement label or block label. The statement or label name must be unique in the block.
属于plsql控制语句，用于程序控制非条件跳至指定标签<<???>>。不易控制和维护，慎用！
二 例子：
1、简单GOTO 语句，判断数字是否为质数：
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