右键点击该表-》设计表，在上面的一排小图标中，点最后一个“条件约束”，点“表”页，在里面更改所有者。(若没有条件约束的小图标，可以点右键，能看到一个“check约束”的选项)

子查询中不能用排序, 只能合并结果集后再排序
select   *   from   ( 
   select   *   from   view_rccdap1   
   union all
   select   *   from   view_rccdap2 
   union all
   select   *   from   view_rccdap3)
order   by   *

SELECT *
FROM (SELECT TOP 20 *
        FROM (SELECT TOP 20 *
                FROM iwear_cube
                WHERE deleted = 0
                ORDER BY createdate DESC) DERIVEDTBL
        ORDER BY createdate) DERIVEDTBL
ORDER BY createdate DESC

1、查找表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断
select * from people
where peopleId in (select   peopleId from   people group by   peopleId having count

(peopleId) > 1)

2、删除表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断，只留有rowid最小的记录
delete from people 
where peopleId in (select   peopleId from people group by   peopleId   having count

(peopleId) > 1)
and rowid not in (select min(rowid) from   people group by peopleId having count(peopleId

)>1)

3、查找表中多余的重复记录（多个字段） 
select * from vitae a
where (a.peopleId,a.seq) in   (select peopleId,seq from vitae group by peopleId,seq having

count(*) > 1)

4、删除表中多余的重复记录（多个字段），只留有rowid最小的记录
delete from vitae a
where (a.peopleId,a.seq) in   (select peopleId,seq from vitae group by peopleId,seq having

count(*) > 1)
and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)

5、查找表中多余的重复记录（多个字段），不包含rowid最小的记录
select * from vitae a
where (a.peopleId,a.seq) in   (select peopleId,seq from vitae group by peopleId,seq having

count(*) > 1)
and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)




查找不重复记录
select distinct * from table