PostgreSQL tillåter inte blandning av UPDATE- och DELETE-satser som underfråga.
Du kan använda en lite annan strategi - uppdateringsbar CTE
postgres=# WITH t1 AS (DELETE FROM foo RETURNING *), t2 AS (INSERT INTO deleted SELECT * FROM t1 RETURNING *) SELECT max(a) FROM t2;
så
postgres=# CREATE TABLE comment(id int, score int); CREATE TABLE postgres=# CREATE TABLE history(id int, comment_id int, vote int); CREATE TABLE postgres=# INSERT INTO comment values(1,10); INSERT 0 1 postgres=# INSERT INTO comment values(2,20); INSERT 0 1 postgres=# INSERT INTO history values(1,1,5); INSERT 0 1 postgres=# WITH t1 AS (DELETE FROM history WHERE id=1 RETURNING comment_id, vote) UPDATE comment SET score=score-t1.vote FROM t1 WHERE t1.comment_id=comment.id; UPDATE 1 postgres=# select * from comment; id | score ----+------- 2 | 20 1 | 5 (2 rows)
Observera:Det kräver 9.1 eller senare