Combine a 'Distinct' SQL Query with a single value query - sql

Question

I have an existing sql query that I'd like to apply to every record returned from a "distinct" query.
I guess something like looping through each of the returned records, storing it as a string, and using that value in the other query. How would I go about this?
sudo queries:
Select ...
for each record returned as X,
Select ... etc ... where ... LIKE X
Edit:
not sure how to make it clearer, but I know I'm probably not making it obvious. I'll try:
The distinct will return a single column, with many records. I need to apply each value to the second sql query.
So like.. Select X and Y, but Y is returned from the 2nd query I have, using X
Edit2:
If the distinct select returns
1
2
3
4
And the second query returns a single record "A" when the where clause looks like ... = '1', "B" when the where clause looks like ... = '2', "C" when the where clause looks like ... = '3', and C when the where clause looks like ... = '4'
Then I'd like my final output to look like
1 | A
2 | B
3 | C
4 | C
Edit 3:
first query:
SELECT DISTINCT [user_id] from dbo.sap_empl_subset
second query:
SELECT [name_pref_mixed]
FROM dbo.sap_empl_subset AS E
WHERE E.sap_position_no IN
(SELECT P.sap_position_no
FROM dbo.sap_position AS P
WHERE (LTRIM(RTRIM(P.sap_position_desc)) LIKE '%[VICE ]PRESIDENT%')
OR (LTRIM(RTRIM(P.sap_position_desc)) LIKE 'CHIEF%'))
AND E.sap_org_code =
(SELECT
CASE
WHEN S.sap_org_code_level2 = 0 THEN S.sap_org_code
WHEN S.sap_org_code_level3 = 0 THEN S.sap_org_code_level1
ELSE S.sap_org_code_level2
END
FROM dbo.sap_org_structure AS S
WHERE S.sap_org_code =
(SELECT E1.sap_org_code
FROM dbo.sap_empl_subset AS E1
WHERE E1.[user_id] = '<each item from first query needs applied here>'))

Answer 1

SELECT *
FROM (
SELECT DISTINCT value
FROM mytable
) x
JOIN othertable y
ON y.value LIKE '%' || x.value || '%'
Update:
If you first query is
SELECT my_x
FROM mytable
WHERE my_y = '…'
and the second one is
SELECT other_z
FROM othertable
WHERE other_y = my_x
the you just need a join:
SELECT my_x, other_z
FROM mytable
JOIN othertable
ON other_y = my_x
WHERE my_y = '…'
It would be much more easy to answer if you just posted the queries.
Update 2:
Try this:
SELECT es.user_id, esp.name_pref_mixed
FROM sap_empl_subset es
JOIN sap_org_structure os
ON os.sap_org_code = es.sap_org_code
JOIN sap_empl_subset esс
ON esc.sap_org_code =
CASE
WHEN os.sap_org_code_level2 = 0 THEN os.sap_org_code
WHEN os.sap_org_code_level3 = 0 THEN os.sap_org_code_level1
ELSE os.sap_org_code_level2
END
WHERE esc.sap_position_no IN
(
SELECT sap_position_no
FROM sap_position sp
WHERE (LTRIM(RTRIM(sp.sap_position_desc)) LIKE '%[VICE ]PRESIDENT%')
OR (LTRIM(RTRIM(sp.sap_position_desc)) LIKE 'CHIEF%'))
)
DISTINCT seems to be redundant here. You have a condition in your second query:
WHERE S.sap_org_code =
(
SELECT E1.sap_org_code
FROM dbo.sap_empl_subset AS E1
WHERE E1.[user_id] = '<each item from first query needs applied here>')
)
which would throw an error if there were duplicates on sap_empl_subset.user_id

Answer 2

A join was not necessary to combine the two queries. All I needed was the nested select syntax as shown below, where the first line is the first query, and the first nested select is the second query. A join was not necessary.
SELECT Distinct U.[user_id] AS "User ID", (
SELECT [empl_last_name]
FROM dbo.sap_empl_subset AS E
WHERE E.sap_position_no IN
(SELECT P.sap_position_no
FROM dbo.sap_position AS P
WHERE (LTRIM(RTRIM(P.sap_position_desc)) LIKE '%[VICE ]PRESIDENT%')
OR (LTRIM(RTRIM(P.sap_position_desc)) LIKE '%CHIEF%')
OR (LTRIM(RTRIM(P.sap_position_desc)) LIKE '%[EXECUTIVE ]VP%')
)
AND E.sap_org_code =
(SELECT
CASE
WHEN S.sap_org_code_level2 = 0 THEN S.sap_org_code
WHEN S.sap_org_code_level3 = 0 THEN S.sap_org_code_level1
ELSE S.sap_org_code_level2
END
FROM dbo.sap_org_structure AS S
WHERE S.sap_org_code =
(SELECT E1.sap_org_code
FROM dbo.user_id AS E1
WHERE E1.[user_id] = U.[user_id]))) As "VP"
From dbo.user_id As U WHERE U.[user_id] <> ''
ORDER BY [User ID]