如何执行此SQL查询

Question

I am having following scenario

Drop Table #Temp
Create Table #Temp(name1 text, name2 text)

Insert INTO #Temp Values ('test','test')
Insert INTO #Temp Values ('test','test')

Insert Into #Temp1 Select * From 
(
;With CTE as (
 Select * from #Temp
 ) 
 select * from CTE
)

I know we can't use CTE as subquery .. but for hard time I don't know exact syntax of subquery since it is being provided by other system.

just image this

 Insert Into #Temp1 Select * From 
    (
     "Query Provided by Other System"
    )

So I don't have any control on subquery (" Query Provided by Other System ").. And I have also tried dynamic sql query like

Declare @subquery nvarchar(max)

set @subquery=';With CTE2 as ( Select * from #Temp) select * from CTE2'

INSERT INTO #Temp1 From (EXEC sp_executesql @subquery)

This also gives error...

More Things to know :

i)I don't know about what are the columns will sub query returns

ii)And I don't have any control in sub query . like what is syntax of subquery and how it looks like?

so from these things, even I can't use dynamic sql ( EXEC sp_executesql ).because I don't know what will happen if @subquery itself contains dynamic sql.

Please help anyone...

Answer 1

Use like this, with dynamic sql. It will work...

Insert Into #Temp1 
EXEC sp_executesql @subquery

Answer 2

You can use the below syntax

;With CTE as (
    Select * from #Temp
) 
Insert Into #Temp1 
Select * 
From (
    select * from CTE
) t

or if you don't have already created the #Temp1 table, use below code. It will automatically create the #temp1 table according to the selected fields

;With CTE as (
    Select * from #Temp
) 
Select * 
Into #Temp1 
From (
    select * from CTE
) t

Besides syntax, you can simplify above SQL code as follows

;With CTE as (
    Select * from #Temp
) 
Insert Into #Temp1 
Select * 
From CTE

or better

Insert Into #Temp1 
Select * from #Temp