Building Subquery to be a column/Field Name - sql

Question

I am unable to bundled groups of subqueries correctly in order to create column titled "Discharge_To"
I am using Teradata Studio Express. I was asked to create a column for field that is not inside a table we normally used. We want to know where a patient was discharged to from a previous place of service. In order to answer this, there has to be steps to determine that. So far, I can get it read correctly until line 94.
Select S.Member_ID, S.PAC_Sty_ID, S.Stay_Admit_Date, S.Stay_Discharge_Date, S.POS, S.LOS,
(
Select
S.Member_ID, S.PAC_Sty_ID,
Case
When S.Discharge_To is null
and H.POS is not null And S.POS <> '12' then 'Home With Care'
When S.Discharge_To is null then 'Home Without Care'
Else S.Discharge_To
End Discharge_To
From (
Select
S.Member_ID, S.PAC_Sty_ID, S.Stay_Admit_Date, S.Stay_Discharge_Date, S.POS,
Case trim(D.POS)
When '21' then 'Hospital' When '23' then 'ER' When '31' then 'SNF'
When '61' then 'IRF' When 'LTAC' then 'LTAC'
End Discharge_To
From ECONIMICS.PAC_02_MODEL_SUMMARY_Combined S
Left Join (
Select S.Member_ID, S.PAC_Sty_ID, S.POS, S.Stay_Admit_Date, S.Stay_Discharge_Date
From ECONIMICS.PAC_02_MODEL_SUMMARY_Combined S
Where PAC_Sty_ID is not null
And POS <> '12'
) D On D.Member_ID = S.Member_ID And D.PAC_Sty_ID <> S.PAC_Sty_ID
And D.Stay_Admit_Date Between S.Stay_Admit_Date and S.Stay_Discharge_Date + 1
Where S.PAC_Sty_ID is not null
Qualify Row_Number() Over (
Partition By S.PAC_Sty_ID Order By Case trim(D.POS)
When '21' then 1 When 'LTAC' then 2 when '61' then 3 When '31' then 4 end
) = 1
) S
Left Join (
Select *
From ECONIMICS.PAC_02_MODEL_SUMMARY_Combined
Where POS = '12'
) H On H.Member_ID = S.Member_ID
And H.From_Date Between S.Stay_Discharge_Date and S.Stay_Discharge_Date + 7
Qualify Row_Number() Over (Partition By S.PAC_Sty_ID Order By H.From_Date) = 1
) E On E.Member_ID = S.Member_ID And E.PAC_Sty_ID = S.PAC_Sty_ID
Where S.PAC_Sty_ID is not Null
AND S.STAY_DISCHARGE_DATE between '2017-01-01' and '2020-12-31'
AND S.LOB in ('CARE', 'DUAL')
AND S.ORPHAN_CLM_ID IS NULL
AND S.ORPHAN_CLM_LN IS NULL
Group By 1, 2, 3, 4, 5, 6
There should be 7 columns with the 7th column titled "Discharge_to" and values in the seventh column would be text (e.g., "Home without Care")

Answer 1

Posting here, since it's easier. Your query doesn't seem to be formatted correctly. It's of this form:
select S.Member_ID, ... ,
(
Select ... -- Sub-query trying to derive Discharge_To field
) E on E.Member_ID = S.Member_ID ...
where ...
A couple notes:
There is no FROM clause in the outer query yet you are trying to return S. fields
There is no S result set to join your E result to
The E result set is trying to be used as a sub-SELECT, but it also has an alias
Not knowing what your error message is, I'd suggest breaking apart the query into its sub-queries and running those individually to try to determine where the problem lies.