xblues 发表于 8-7-2010 04:49:12

kaile 发表于 9-7-2010 20:30:52

存储过程@@

TtiGeR 发表于 11-7-2010 00:23:49

Oracle http://download.oracle.com/docs/cd/B19306_01/server.102/b14357/ch12003.htm#BACIEHDJ

SQL Server里@@开头的一般是系统函数（过去也曾称其为全局变量）
http://msdn.microsoft.com/en-us/library/ms187953.aspx

The names of some Transact-SQL system functions begin with two at signs (@@). Although in earlier versions of Microsoft SQL Server, the @@functions are referred to as global variables, they are not variables and do not have the same behaviors as variables. The @@functions are system functions, and their syntax usage follows the rules for functions.

搜索：
http://lmgtfy.com/?q=%22two+at+signs%22+stored+procedure
http://lmgtfy.com/?q=%22double+at+sign%22+stored+procedure
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查看完整版本: 如何用Google查询特殊符号啊？比如查询　@@