I don't know how to write the query for below.
My table is
col1 col2
5 1
5 5
5 6
5 7
4 5
4 8
4 9
4 3
3 3
3 5
I need to select distinct col1 id where both parameters exists in col2. eg. if i send 6,7 it should send me 5
Try:
SELECT col1
FROM mytable
WHERE col2 IN (6, 7)
GROUP BY col1
HAVING COUNT(DISTINCT col2) = 2
Erwin Brandstetter
This is probably among the fastest solutions:
SELECT col1 -- already DISTINCT?
FROM tbl t1
JOIN tbl t2 USING (col1)
WHERE t1.col2 = 6
AND t2.col2 = 7;
Assuming a PRIMARY KEY or UNIQUE constraint on (col1, col2), like it's typically implemented. Else add DISTINCT.
There are many other ways to implement relational division. Here are some:
来源：https://stackoverflow.com/questions/41143947/finding-combinations-of-specific-values