SQL-Query-Question: get all ID2 which have specific ID1

Question

Hello,
I have a table Tab1 with millions of entries like
ID1    ID2
1       aa
4       aa
1       bb
4       cc
I'm looking for a sql-query which gives me all ID2-values which have a all of the supplied ID1, in the example above if I query for 1 4 then I want aa and not bb or cc because bb has only 1 and cc only 4.
The values of ID1 could be a lot like (1,2,3,5,7,8,9,10,34,4,67,33,53,43...).
Greetings
Stefan

Answer 1

just this
SELECT ID1,ID2
FROM Table t
WHERE EXISTS (SELECT 1
FROM Table
AND ID2 = t.ID2
HAVING COUNT(DISTINCT CASE WHEN ID1 IN (1,4) THEN ID1 ELSE NULL END) = 2
If you want you can pass values 1,4 through a parameter to make it generic like below           
DECLARE @ValueList varchar(10)
SET @ValueList = '1,4'
SELECT ID1,ID2
FROM Table t
WHERE EXISTS (SELECT 1
FROM Table
WHERE ID2 = t.ID2
HAVING COUNT(DISTINCT CASE WHEN ',' + @ValueList + ',' LIKE '%,' + CAST(ID1 AS varchar(5)) + ',%' THEN ID1 END) = LEN(@ValueList) - LEN(REPLACE(@ValueList,',','')) + 1
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