SQL Insert Into Temp Table in both If and Else Blocks

Question

I\'m trying to populate a temp table based on the result of a condition in SQL 2005. The temp table will have the same structure either way, but will be populated using a d

Answer 1

Here is a solution which I use if temp table can't be created upfront and don't want to put core logic in dynamic SQL.

IF 1 = 1 -- Replace with actual condition
BEGIN
    SELECT * INTO #tmp1 FROM dbo.Table1
END
ELSE
BEGIN
    SELECT * INTO #tmp2 FROM dbo.Table2
END

-- Inserting data into global temp table so sql server can't complain on not recognizing in a context
DECLARE @Command VARCHAR(MAX)
IF OBJECT_ID('tempdb..#tmp1') IS NOT NULL
BEGIN
    SET @Command = 'SELECT * INTO ##tmp FROM #tmp1'
END
ELSE
BEGIN
    SET @Command = 'SELECT * INTO ##tmp FROM #tmp2'
END

EXECUTE(@Command)
SELECT * INTO #tmpFinal FROM ##tmp -- Again passing data back to local temp table from global temp table to avoid seeing red mark

IF OBJECT_ID('tempdb..##tmp') IS NOT NULL DROP TABLE ##tmp
IF OBJECT_ID('tempdb..#tmp1') IS NOT NULL DROP TABLE #tmp1
IF OBJECT_ID('tempdb..#tmp2') IS NOT NULL DROP TABLE #tmp2

SELECT * FROM #tmpFinal

IF OBJECT_ID('tempdb..#tmpFinal') IS NOT NULL DROP TABLE #tmpFinal