时间:2021-07-01 10:21:17 帮助过:37人阅读
union带有orderby的sql时,orderby需要放到子查询语法才有效 无 --union和order by连用需要放在子查询中,否则会报错--例如:--错误写法:select * from dept1 order by deptnounionselect * from dept2 order by deptno;--ORA-00933 "SQL command not proper
union带有order by的sql时,order by需要放到子查询语法才有效 <无>--union和order by连用需要放在子查询中,否则会报错 --例如: --错误写法: select * from dept1 order by deptno union select * from dept2 order by deptno; --ORA-00933 "SQL command not properly ended" --正确写法: select * from (select * from dept1 order by deptno) union select * from (select * from dept2 order by deptno);