Question

我的情况是：

我有一个像这样（简化）结构的表 -

CREATE TABLE [dbo].[pe_mem](
    [pm_member] [int] NULL,
    [pm_surname] [char](50) NULL,
    [pm_forename] [char](50) NULL,
    [pm_rsi_num] [char](11) NULL

) ON [PRIMARY]

我需要运行一个查询来查找相同 pm_rsi_num但不同 pm_surname的所有行。

任何人都可以帮我解决这个问题吗？

谢谢！

Answer 1

您可以使用自联接：

select  *
from    pe_mem t1
join    pe_mem t2
on      t1.pm_rsi_num = t2.pm_rsi_num
        and t1.pm_surname <> t2.pm_surname

Answer 2

只需将表格重新加入，并使用您的条件作为加入条件：

select * from pe_mem as p1
inner join pe_mem as p2
on p1.pm_rsi_num = p2.pm_rsi_num
    and p1.pm_surname <> p2.pm_surname

Answer 3

存在变体：

select  *
from    pe_mem t1
where exists
(select null
 from   pe_mem t2
 where  t1.pm_rsi_num = t2.pm_rsi_num
        and t1.pm_surname <> t2.pm_surname)

单表扫描版本：

select pm_rsi_num
from pe_mem
group by pm_rsi_num
having count(distinct pm_surname) > 1

T-SQL检查重复的field1值但不同的field2值

3 个答案: