PostgreSQL - max number of parameters in “IN” clause?

Question

In Postgres, you can specify an IN clause, like this:

SELECT * FROM user WHERE id IN (1000, 1001, 1002)

Does anyone know what\'s the maximu

Answer 1

If you have query like:

SELECT * FROM user WHERE id IN (1, 2, 3, 4 -- and thousands of another keys)

you may increase performace if rewrite your query like:

SELECT * FROM user WHERE id = ANY(VALUES (1), (2), (3), (4) -- and thousands of another keys)