INSERT INTO <table> (c1, c2, .., cn)
VALUES (v1, v2, .., vn)
RETURNING <expression>
INTO <variables>
UPDATE <table> SET (c1) = (v1), (c2) = (v2), (cn) = (vn)
WHERE <condition>
RETURNING <expression>
INTO <variables>
DELETE FROM <table>
WHERE <condition>
RETURNING <expression>
INTO <variables>