Question

Consider I have a table named table1 which contains following data:

id, value
1, a
1, b
1, c
1, d
2, a
2, b
2, c
3, b
3, c
4, a
4, b
4, c
4, d

I wanted to select all ids that have a value = d. How could I achieve this?

Which means I need to get the result of ( 1 and 4 ) , since id 2 and 3 do not contain d.

the actual table contains more than 10,000,000 rows, so the query should not be too slow.

Thanks for your ideas.

Answer 1

You don’t need a join at all:

SELECT id
FROM myTable
WHERE value = 'd'