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【单选题】
关于用户会话变量,下列描述错误的是( )。A.
客户机 1 定义的会话变量不能被客户机 2 使用
B.
用户会话变量以 @ 开头
C.
可以使用 set 命令和 select 语句对用户会话变量进行赋值
D.
用户会话变量的作用范围同系统变量的范围一样大
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