Temp table throws invalid object name after adding 'SET SHOWPLAN_ALL' Sql Server MS17 - sql

Question

I'm fairly new to SQL Server and I've been assigned the task of optimizing some SQL Queries generated by a CMS. After I add the code
SET SHOWPLAN_ALL ON
GO;
and execute the query, the local temp table #tempSecondLevel throws an 'invalid object name' exception in my INSERT INTO statement. You will see a SELECT INTO #tmpSecondLevel statement and then an INSERT INTO #tmpSecondLevel statement. The next statements are for #tmpFirstLevel, and I'm not sure if those are relevant to this question.
use Kentico8_2;
go
set showplan_all on;
go
-- Write revised query here.
DECLARE #ProductNodeGuid uniqueidentifier = '6F6F733D-AE4F-47DC-9BE9-52B967E9F41D'
IF OBJECT_ID('tempdb..#tmpSecondLevel') IS NOT NULL
DROP TABLE #tmpSecondLevel
IF OBJECT_ID('tempdb..#tmpFirstLevel') IS NOT NULL
DROP TABLE #tmpFirstLevel
-- Get all of the items(that go on the secondLevel) that go underneath a heading(on the firstLevel)
-- Get all of the materials that belong to this node that go on the second level
SELECT
NodeLevel = 1
,NodeParentID = CASE WHEN MaterialTypeSelectByMaterial = 0 THEN M.NodeID ELSE M.NodeParentID END
,M.NodeID
,M.MaterialName
,MaterialImage = MV.MaterialVariantImage
,M.NodeAliasPath
,M.Published
,M.NodeGUID
,M.ClassName
,M.NodeOrder
INTO
#tmpSecondLevel
FROM
View_NOF_Material_Joined M
JOIN View_NOF_Product_Joined P
ON P.ProductMaterialNodeGuidList LIKE '%' + CONVERT(nvarchar(36), M.NodeGUID) + '%'
JOIN View_NOF_MaterialType_Joined MT
ON MT.NodeID = M.NodeParentID
LEFT JOIN View_NOF_MaterialVariant_Joined MV
ON MV.NodeParentID = M.NodeID AND MV.NodeOrder = 1 -- always the first
WHERE
P.NodeGUID = #ProductNodeGuid AND MaterialTypeSelectByMaterial = 1
-- Get all of the material variants that belong to this node that go on the second level
INSERT INTO
#tmpSecondLevel
SELECT
NodeLevel = 1
,NodeParentID = CASE WHEN MaterialTypeSelectByMaterial = 0 THEN M.NodeID ELSE M.NodeParentID END
,MV.NodeID
,MaterialName = MV.MaterialVariantName
,MaterialImage = MV.MaterialVariantImage
,MV.NodeAliasPath
,MV.Published
,MV.NodeGUID
,MV.ClassName
,MV.NodeOrder
FROM
View_NOF_MaterialVariant_Joined MV
JOIN View_NOF_Product_Joined P
ON P.ProductMaterialNodeGuidList LIKE '%' + CONVERT(nvarchar(36), MV.NodeGUID) + '%'
JOIN View_NOF_Material_Joined M
ON M.NodeID = MV.NodeParentID
JOIN View_NOF_MaterialType_Joined MT
ON MT.NodeID = M.NodeParentID
WHERE
P.NodeGUID = #ProductNodeGuid
AND MaterialTypeSelectByMaterial = 0
-- Get all of the headings( for the firstLevel) that go above a list of items(on the secondLevel)
-- Get all of the material types that are used as headings
SELECT DISTINCT
NodeLevel = 0
,NodeParentID = NULL
,MT.NodeID
,MaterialName = MT.MaterialTypeName
,MaterialImage = ''
,MT.NodeAliasPath
,MT.Published
,MT.NodeGUID
,MT.ClassName
,MT.NodeOrder
INTO
#tmpFirstLevel
FROM
View_NOF_MaterialType_Joined MT
INNER JOIN #tmpSecondLevel M
ON MT.NodeID = M.NodeParentID
-- Get all of the materials that are used as headings
INSERT INTO
#tmpFirstLevel
SELECT DISTINCT
NodeLevel = 0
,NodeParentID = NULL
,MJ.NodeID
,MaterialName = MJ.MaterialName
,MaterialImage = ''
,MJ.NodeAliasPath
,MJ.Published
,MJ.NodeGUID
,MJ.ClassName
,MTJ.NodeOrder
FROM
View_NOF_Material_Joined MJ
INNER JOIN View_NOF_MaterialType_Joined MTJ
ON MTJ.NodeID = MJ.NodeParentID
INNER JOIN #tmpSecondLevel M
ON MJ.NodeID = M.NodeParentID
-- Put all of the second level items (the details) and first level items (the headings) in the same table
SELECT * FROM #tmpSecondLevel
UNION
SELECT * FROM #tmpFirstLevel
ORDER BY NodeOrder
IF OBJECT_ID('tempdb..#tmpSecondLevel') IS NOT NULL
DROP TABLE #tmpSecondLevel
IF OBJECT_ID('tempdb..#tmpFirstLevel') IS NOT NULL
DROP TABLE #tmpFirstLevel
I predict this is a simple question to ask since I only added two lines of code, but the help is much appreciated. If you have any tips for me about optimizing these queries, that is greatly appreciated as well.
Thanks in advance.

Answer 1

You are getting the error because SET SHOWPLAN_ALL is the command to show Estimated execution plans. Therefore no TSQL commands are actually executed, and thus the #tmpSecondLevel table is never created. So you get an error. This would be the same thing as clicking the "Display Estimated Execution Plan" in SSMS.
You can read about that command here: https://learn.microsoft.com/en-us/sql/t-sql/statements/set-showplan-all-transact-sql
If you want to show the Actual execution replace SHOWPLAN_ALL line with SET STATISTICS XML ON. This will display the actual execution plan when you run the query.