SQL Server WITH statement

Question

我的目标是从一个CTE中选择结果，并在同一过程中用另一个CTE.插入到另一个表中。怎么做？

我的错误是…

无效的对象名称xy。

我的查询是

WITH ds
(
    Select a, b, c 
    from test1    
),
xy
(
    select d, e, f 
    from test2 
    where (uses conditions from ds)    
)
Select * 
from ds  (the result set of ds, am exporting this to csv)
Insert into AuditTest
(
  Select * from xy
)

Answer 1

CTE只适用于一个查询，但看起来您可以在每个查询中使用一个CTE：

WITH ds AS
(
  Select a, b, c from test1    
)
Select * from ds  (the result set of ds, am exporting this to csv)

WITH xy AS
(
 select d,e,f from test2 where (uses conditions from test1)    
)
Insert into AuditTest
(
  Select * from xy
)

Answer 2

实际上，您可以使用output子句来返回插入的行，同时插入和输出结果。

;WITH ds AS
(
  Select a, b, c from test1 
),
xy AS
(
 select d, e, f from test2 where (uses conditions from ds)
)
Insert into AuditTest
output inserted.d, inserted.e, inserted.f
Select d, e, f from xy

或真正的测试

CREATE TABLE #Test (a int)
;WITH ds AS
(
  Select 0 as a, 1 as b, 2 as c 
),
xy AS
(
 select a as d, b as e from ds
)
Insert into #Test 
OUTPUT inserted.a
Select e from xy

Answer 3

您可以这样运行INSERT，不能在cte:之后运行多个查询

;WITH ds AS (  Select a, b, c 
              from test1    
           )
    ,xy AS (  select d,e,f 
              from test2 
              where (uses conditions from test1)    
           )
Insert into AuditTest
Select * 
from xy

在这种情况下，使用临时表可能是有益的，因为否则您将多次重新运行查询。