Two columns in subquery in where clause

Question

I have a query:

SELECT s.period, s.year, s.amount 
FROM salaries s

I would like to select from salaries table only the rows th

Answer 1

You can use more than one column for an IN condition:

SELECT s.period, s.year, s.amount 
FROM salaries s
where (s.year, s.period) in (select year, period from periods)

But Gordon's not exists solution is probably faster.

Answer 2

Try this:

SELECT s.period, s.year, s.amount FROM salaries s
where s.period in (select period from periods)
and s.year in (select year from periods)

Answer 3

Does this work with your environment?

WHERE EXISTS (SELECT 1
              FROM periods p
              WHERE p.period = s.period AND p.year = s.year
             )