如果您不能在 SELECT 中使用它，如何使用 MS SQL 区分列？

Question

这是我的代码

 select pd.postFilial as postoffice,
        cr.number as region,
        coalesce(cd.number, cr.number) as district,
        c.number as city,
        pd.postIndex as postcode,
        pd.name as name,
        lf.reason as lock_reason
 from pn_district pd
 inner join cd_city c on c.NUMBER = pd.cityDistrict
 left join pn_lockfilial lf with (nolock) on lf.id_postfilial = pd.postFilial
 left join cd_region cd  on cd.number = c.parent_id
 left join cd_region cr on cr.number = isNull(cd.parent_id, c.parent_id)
 where YEAR(pd.datestop) = 9999;

我想使 pd.name 不同，因为没有它我会得到类似

的结果

33000000274479  600000002   500000000   1008302400458   21010   1
33000000274479  600000002   500000000   1008302400458   21010   1
33000000274479  600000002   500000000   1008302400458   21010   2
33000000274479  600000002   500000000   1008302400458   21010   2
32000100440927  600000002   500000000   1008302400458   21023   4
32000100440927  600000002   500000000   1008302400458   21023   4
32000100440927  600000002   500000000   1008302400458   21023   5
32000100440927  600000002   500000000   1008302400458   21023   5

但我需要这个版本

33000000274479  600000002   500000000   1008302400458   21010   1
33000000274479  600000002   500000000   1008302400458   21010   2
32000100440927  600000002   500000000   1008302400458   21023   4
32000100440927  600000002   500000000   1008302400458   21023   5

求助，我需要最简单的解决方案，没有任何 CTE 等... 谢谢！

Answer 1

对 select 语句中的所有列使用 Group by。

 select pd.postFilial as postoffice,
        cr.number as region,
        coalesce(cd.number, cr.number) as district,
        c.number as city,
        pd.postIndex as postcode,
        pd.name as name,
        lf.reason as lock_reason
 from pn_district pd
 inner join cd_city c on c.NUMBER = pd.cityDistrict
 left join pn_lockfilial lf with (nolock) on lf.id_postfilial = pd.postFilial
 left join cd_region cd  on cd.number = c.parent_id
 left join cd_region cr on cr.number = isNull(cd.parent_id, c.parent_id)
 where YEAR(pd.datestop) = 9999
 group by pd.name, pd.postFilial, cr.number, coalesce(cd.number, cr.number), c.number, pd.postIndex, lf.reason
 ;

Answer 2

您可以按 select 的所有列分组，或使用 DISTINCT:

 select DISTINCT
        pd.postFilial as postoffice,
        cr.number as region,
        coalesce(cd.number, cr.number) as district,
        c.number as city,
        pd.postIndex as postcode,
        pd.name as name,
        lf.reason as lock_reason
 from pn_district pd
 inner join cd_city c on c.NUMBER = pd.cityDistrict
 left join pn_lockfilial lf with (nolock) on lf.id_postfilial = pd.postFilial
 left join cd_region cd  on cd.number = c.parent_id
 left join cd_region cr on cr.number = isNull(cd.parent_id, c.parent_id)
 where YEAR(pd.datestop) = 9999

如果您不能在 SELECT 中使用它，如何使用 MS SQL 区分列？

How to distinct column using MS SQL if u can't use it in SELECT?

sql-server

distinct