SELECT C.COLUMN_NAME FROM information_schema.table_constraints AS pk
INNER JOIN information_schema.KEY_COLUMN_USAGE AS C ON
C.TABLE_NAME = pk.TABLE_NAME AND
C.CONSTRAINT_NAME = pk.CONSTRAINT_NAME AND
C.TABLE_SCHEMA = pk.TABLE_SCHEMA
WHERE pk.TABLE_NAME = 'test' AND pk.TABLE_SCHEMA = 'test_db'
AND pk.CONSTRAINT_TYPE = 'PRIMARY KEY';
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