How to get save result from EXECUTE from a dynamic SQL query in another table?

Question

Hi everyone, 
I have this query:
declare @query varchar(max) = ''
declare @par varchar(10)
SELECT @par = col1 FROM Set
declare @region varchar(50)
SELECT @region = Region FROM Customer
declare @key int
SELECT @key = CustomerKey FROM Customer
SET @query = 'SELECT CustomerKey FROM Customer where ' + @par + ' = '+ @key+ ' '
EXECUTE (@query)
With this query I want get col1 from SET and compare it to the column Region from Customer. I would like to get the matching CustomerKey for it.
After execution it says commands are executed successfully. But I want to save the result from @query in another table. I looked it up and most people say to use sp_executesql. I tried a few constructions as sampled and I would always get this error: 
Msg 214, Level 16, State 2, Procedure sp_executesql, Line 12
Procedure expects parameter '@statement' of type 'ntext/nchar/nvarchar'.
So the output should be a list of CustomerKeys in another table.
How can I save the results from EXECUTE into a variable? Then I assume I can INSERT INTO - SELECT in another table. 
Thanks

Answer 1

CREATE TABLE Customer
(CustomerKey INT , Name NVARCHAR(100));
GO
INSERT dbo.Customer
VALUES ( 1, N'Sam' )
GO
DECLARE @query nvarchar(max) = ''
declare @par varchar(10) = 'Name',
@key varchar(10) = 'Sam'
CREATE TABLE #temp ( CustomerKey INT );
SET @query =
insert #temp
SELECT CustomerKey
FROM Customer
where ' + @par + ' = '''+ @key+ ''' '
PRINT @query
EXEC sp_executesql @query
SELECT *
FROM #temp
DROP TABLE #temp;
DROP TABLE dbo.Customer
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Saeid Hasani
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