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//查询出重复了的列的值select name from accp.first group by name having count(name)>2;
create table new_table as select * from old_table where 1=2
问题提出：SQL〉DROP USER USER1 CASCADEERROR：ORA-01940: cannot drop a user that is currently connected由于当前用户正连接到数据库，所以无法删除解决办法：1、查询此用户的会话进程，SQL〉SELECT&n
打开命令行工具，进入build.xml所在目录，执行命令：ant -f build.xml
have a test
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