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1）在sqlplus中直接输入define查看一下定义的常量SYS@ORCL>defineDEFINE _DATE           = "2012-08-21 23:50:55" (CHAR)DEFINE _CONNECT_IDENTIFIER = "ORCL" (CHAR)DEFINE _USE...

一：SQL*Plus帮助SQL>help indexEnter Help [topic] for help. @             COPY         PAUSE            ...