Question

主表：Select * from Table1

Id  Name1 Name2

101  ttt  sss

第二张表：Select * from Table2

SId  Id  Colum1 Column2  Column3

1    101  hhh     xxx    erre

2    101  wsa     tgf     fdfd

第三张表：Select * from Table3

TId  Id   TColumn1  Tcolumn2

5    101   uyt       uyu

我的查询：

Select * from Table1 t1
Join Table2 t2 on t2.Id= t1.Id
Join Table3 t3 on t3.Id= t1.Id

我正在像这样打算数据

 Id  Colum1 Column2  Column3  TColumn1  Tcolumn2

 1   hhh     xxx    erre      uyt          uyu

 2   wsa     tgf     fdfd     uyt          uyu

我想要的是我的数据

 Id  Colum1 Column2  Column3  TColumn1  Tcolumn2

 1   hhh     xxx    erre      uyt          uyu

 2   wsa     tgf    fdfd     null         null

Answer 1

您可以使用以下查询

 ; with cte as 
    (
    Select 
    Colum1,
    Column2,
    Column3,
    TColumn1,
    Tcolumn2,
    row_number () over(partition by t2.id order by SId asc) r
    from Table1 t1
    Join Table2 t2 on t2.Id= t1.Id
    Join Table3 t3 on t3.Id= t1.Id
    )

Select 
Colum1,
Column2,
Column3,
TColumn1 =case when r=1 then TColumn1 else NULL end,
Tcolumn2 =case when r=1 then Tcolumn2 else NULL end
from cte

的 See working demo

如何只从三个表中获取匹配的数据

1 个答案: