Dynamic SQL SQL Server 2012 Get Result into a #temp table - sql

Question

I am using SQL Server 2012. I will like to get final result from #sql into a temp table.Here is my code so far. Thanks for your help.
IF OBJECT_ID ('tempdb.dbo.#MY_DT_CTE') IS NOT NULL DROP TABLE #MY_DT_CTE
CREATE TABLE #MY_DT_CTE
([ROWID] INT NOT NULL IDENTITY (1,1)
,[YYYYMM] INT
)
; WITH MY_DT_CTE AS
(
SELECT CONVERT(INT,CONVERT(VARCHAR(6),EOMONTH(GETDATE(),-1),112)) AS [YYYYMM]
UNION
SELECT CONVERT(INT,CONVERT(VARCHAR(6),EOMONTH(GETDATE(),-2),112)) AS [YYYYMM]
UNION
SELECT CONVERT(INT,CONVERT(VARCHAR(6),EOMONTH(GETDATE(),-3),112)) AS [YYYYMM]
UNION
SELECT CONVERT(INT,CONVERT(VARCHAR(6),EOMONTH(GETDATE(),-4),112)) AS [YYYYMM]
UNION
SELECT CONVERT(INT,CONVERT(VARCHAR(6),EOMONTH(GETDATE(),-5),112)) AS [YYYYMM]
UNION
SELECT CONVERT(INT,CONVERT(VARCHAR(6),EOMONTH(GETDATE(),-6),112)) AS [YYYYMM]
)
INSERT INTO #MY_DT_CTE
SELECT [YYYYMM] FROM MY_DT_CTE
ORDER BY [YYYYMM] DESC;
-- SELECT * FROM #MY_DT_CTE
DECLARE #columns NVARCHAR(MAX), #sql NVARCHAR(MAX);
SET #columns = N'';
SELECT #columns += N', p.' + QUOTENAME(YYYYMM)
FROM (SELECT p.YYYYMM FROM #MY_DT_CTE AS p
GROUP BY p.YYYYMM) AS x;
SET #sql = N'
SELECT ' + STUFF(#columns, 1, 2, '') + '
FROM
(
SELECT p.YYYYMM FROM #MY_DT_CTE AS p
) AS j
PIVOT
(
COUNT(YYYYMM) FOR YYYYMM IN ('
+ STUFF(REPLACE(#columns, ', p.[', ',['), 1, 1,
'')
+ ')
) AS p;';
PRINT #sql;
EXEC sp_executesql #sql;
Need to bring this result #sql into a temp table.
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Answer 1

An easy way would be to use a global temporary table. This can be selected into in the dynamic SQL scope to automatically have the desired schema and still be available after that exits.
SET #sql = N'
SELECT ' + STUFF(#columns, 1, 2, '') + '
INTO ##GlobalTemp
FROM
(
SELECT p.YYYYMM FROM #MY_DT_CTE AS p
) AS j
PIVOT
(
COUNT(YYYYMM) FOR YYYYMM IN (' + STUFF(REPLACE(#columns, ', p.[', ',['), 1, 1, '') + ')
) AS p;';
EXEC sp_executesql #sql;
SELECT *
FROM ##GlobalTemp
However this can cause issues with naming clashes if the code is ever executed concurrently.
It is possible to use a local temp table but the code is more involved as it involves creating a temp table at the upper scope and then using dynamic SQL to alter it to the dynamically determined schema before inserting into it.
CREATE TABLE #T
(
Dummy INT
);
SET #sql = 'ALTER TABLE #T ADD Dummy2 INT' + REPLACE(REPLACE(#columns, 'p.', ''), ']', '] int') + ';
ALTER TABLE #T DROP COLUMN Dummy, Dummy2;'
EXEC (#sql);
SET #sql = N'
INSERT INTO #T
SELECT ' + STUFF(#columns, 1, 2, '') + '
FROM
(
SELECT p.YYYYMM FROM #MY_DT_CTE AS p
) AS j
PIVOT
(
COUNT(YYYYMM) FOR YYYYMM IN (' + STUFF(REPLACE(#columns, ', p.[', ',['), 1, 1, '') + ')
) AS p;';
EXEC sp_executesql #sql;
SELECT *
FROM #T