WHERE_IN query with a composite key?

Question

Let\'s say I have a table with a two-part composite key, and 4 records, like the following:

KEY_PART_1 KEY_PART_2
A          1
B          1
C          2
C            


        

Answer 1

This syntax works for Oracle and PostgreSQL:

SELECT *
  FROM table_name
 WHERE (key_part_1, key_part_2) IN ( ('B',1), ('C',2) );