A global variable is a representation of a changeable value which can be accessed and modified using SQL statements.

全局变量表示一个可以使用sql语句访问和修改的可变值。

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A global variable is a representation of a changeable value which can be accessed and modified using SQL statements.

全局变量表示一个可以使用sql语句访问和修改的可变值。

youdao