Question

我有三张桌子。我插入的第三个更改是在表1和2之间创建的

我的问题是我无法修复删除语句，我尝试从column1'Dog'中删除。表3应仅包含一天中值的更改。

Table1 ---Yesterday
Column1 Column2    Column3 Column4
Dog       Blue      555      poo
Dog       Brown     666      hoo
Dog       Black     666      hoo
Mouse     Red       888      nic
Cat       Ping      444      pic

Table2 ---Today
Column1 Column2    Column3 Column4
Dog       Colour     555       poo ---Change column2
Dog       Brown      888       hoo ---Change column3
Dog       Black      666       hoo --- No change
Mouse     Red        888       nicoo ---Change column4
Cat       Ping       444       pic --- No change


Table3 ---Changes between days
Column1 Column2 Column3 Column4
Dog       Colour     555       poo ---Change column2
Dog       Brown      888       hoo ---Change column3
Dog       Black      666       hoo --- No change
Mouse     Red        888       nicoo ---Change column4

Table3 ---Expect Output
Mouse     Red        888       nicoo ---Change column4
Dog       Colour     555       poo ---Change column2
Dog       Brown      888       hoo ---Change column3


SELECT       *
FROM         [dbo].[Table3]
WHERE   Column1 = 'Dog' and    (  EXISTS
                             (SELECT     * 
                               FROM       [dbo].[Table2]  
                               WHERE        ([Table2].Column1 = Column1) AND ([Table2].Column1 = Column1
                                and 

    [Table3].[Column1] <> [Table1].[Column1] or
    [Table3].[Column2] <> [Table1].[Column2] or
    [Table3].Column3 <> [Table1].Column3 or 
    [Table3].Column4 <> [Table1].Column4 or 
    )))

感谢您帮助我找到删除声明的解决方案！

Answer 1

您可以通过正确加入 -

来实现这一目标

create table #Table1 (Column1 varchar(10) ,Column2 varchar(10)    ,Column3 int,Column4 varchar(10))
insert into #Table1
select 'Dog'       ,'Blue',      555      ,'poo'
union all select 'Dog'       ,'Brown',     666      ,'hoo'
union all select 'Dog'       ,'Black',     666      ,'hoo'
union all select 'Mouse'     ,'Red',       888      ,'nic'
union all select 'Cat'       ,'Ping',      444      ,'pic'

create table #Table2 (Column1 varchar(10) ,Column2 varchar(10)    ,Column3 int,Column4 varchar(10))
insert into #Table2
select 'Dog',       'Colour',     555       ,'poo'
union all select 'Dog',       'Brown',      888       ,'hoo' 
union all select 'Dog',       'Black',      666       ,'hoo' 
union all select 'Mouse',     'Red',        888       ,'nicoo' 
union all select 'Cat',       'Ping',       444       ,'pic' 

select t2.*
from #Table1 t1
right join #Table2 t2
on t1.Column1 = t2.Column1
and t1.Column2 = t2.Column2
and t1.Column3 = t2.Column3
and t1.Column4 = t2.Column4
where t1.Column1 is null  

--OUTPUT
Column1 Column2 Column3 Column4
Dog     Colour  555     poo
Dog     Brown   888     hoo
Mouse   Red     888     nicoo

MS SQL删除具体值在哪里是条件

1 个答案: