Combine two pivot tables SQL Server - sql

Question

I am trying to cross join two pivot tables.
--First Pivot table query gets columns of drug_names and produces the row value
--of the drug_id.
DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX)
Select #cols = STUFF((SELECT ',' + QUOTENAME(drug)
from _app_drugs
group by drug, drug_id,order_number
order by order_number
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query = N'SELECT ' + #cols + N' from
(
select drug_id, drug
from _app_drugs
) x
pivot
(
max(drug_id)
for drug in (' + #cols + N')
) p'
exec sp_executesql #query;
--The second pivot table simply gets the signature_labels and displays the label name in the column and displays the label_id as the row value.
DECLARE #cols AS NVARCHAR(MAX),#scols as NVARCHAR(MAX),
#query AS NVARCHAR(MAX)
Select #cols = STUFF((SELECT ',' + QUOTENAME(signature_label)
from _app_signature_labels
WHERE _app_signature_labels.isactive=1
group by signature_label_id, signature_label,ordernumber
order by ordernumber
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query = N'SELECT ' + #cols + N' from
(
select signature_label_id,signature_label
from _app_signature_labels
) x
pivot
(
max(signature_label_id)
for signature_label in (' + #cols + N')
) p'
exec sp_executesql #query;
Now I just need to know how to combine these two pivot tables as one table... they don't have a common field and don't need one.
Can anybody help me with this one?
Thank you

Answer 1

You can execute two separate dynamic SQL statements into two global temp tables and then combine the result, like this:
IF object_id('tempdb..##tmpResult1') IS NOT NULL
BEGIN
DROP TABLE ##tmpResult1
END
IF object_id('tempdb..##tmpResult2') IS NOT NULL
BEGIN
DROP TABLE ##tmpResult2
END
DECLARE #cols AS NVARCHAR(MAX),
#cols2 AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX),
#query2 AS NVARCHAR(MAX)
Select #cols = STUFF((SELECT ',' + QUOTENAME(drug)
from _app_drugs
group by drug, drug_id,order_number
order by order_number
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query = N'SELECT ' + #cols + N' INTO ##tmpResult1 from
(
select drug_id, drug
from _app_drugs
) x
pivot
(
max(drug_id)
for drug in (' + #cols + N')
) p'
exec sp_executesql #query;
--The second pivot table simply gets the signature_labels and displays the label name in the column and displays the label_id as the row value.
Select #cols2 = STUFF((SELECT ',' + QUOTENAME(signature_label)
from _app_signature_labels
WHERE _app_signature_labels.isactive=1
group by signature_label_id, signature_label,ordernumber
order by ordernumber
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query2 = N'SELECT ' + #cols2 + N' INTO ##tmpResult2 from
(
select signature_label_id,signature_label
from _app_signature_labels
) x
pivot
(
max(signature_label_id)
for signature_label in (' + #cols2 + N')
) p'
exec sp_executesql #query2;
SELECT * FROM ##tmpResult1 t1
INNER JOIN ##tmpResult2 t2 ON t1.ordernumber = t2.ordernumber
This is also a way to address this error when doing a large PIVOT query: Internal error: An expression services limit has been reached. Please look for potentially complex expressions in your query, and try to simplify them.