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union orDEr By

您好,我来为您解答: select a,b,c,d from (select t1.a,t1.b,t1.c from t1 where t1.e = ' ' union all select t2.a,t2.b,t2.c from t2 where t2.e = ' ') order by a order by的优先级比union all 要低,因此如果有union ,会先执行union,再...

尝试用 oder by 1; SELECT SALING_DATE, JOB, NAME FROM TABLE1 UNION SELECT ARRIVE_DATE, JOB, NAME FROM TALBE2 order by 1;

union使用时必须时前后连接的操作语句一模一样,order by 进行排序时也要选取相同的参数。 ~如果你认可我的回答,请及时点击【采纳为满意回答】按钮 ~~手机提问的朋友在客户端右上角评价点【满意】即可。 ~你的采纳是我前进的动力 ~~O(∩_∩)O,记...

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...

select t.* from(select xx,yy,zz from t1union allselect xx,yy,zz from t2union all……) torder by 字段

select * from ( select u.*, r.statusname, p.*, c.* from UserLogin U, RepairStatus R, Product P, Customer C where U.status = R.statusid and U.ProductName = P.ProductName and U.BoatName = C.BoatName and U.RepairDate

(select top 9 * from table1 order by id) union (select top 19 * from table2 order by id) union (select top 99 * from table3 order by id) 你如果想union之后再order by的话得使用子查询

union使用时必须时前后连接的操作语句一模一样,order by 进行排序时也要选取相同的参数。

order by只能用于外部查询中,不能应用于子查询中。 上面的sql,union all合并了2个sql查询结果集,order by当成union all合并结果集的排序,但是结果集中无表a和字段bqdm。 select * from (select a.bqdm,sum(a.zyrs) 今日在院人数 from YZCX_Y...

因为在ubion之后只会保留一个表的字段,会采用第一个的

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