PostgreSQL ALTER SEQUENCE功能

Question

我有触发功能:

CREATE OR REPLACE FUNCTION update_aaa() RETURNS TRIGGER AS $$
DECLARE maxid INTEGER;
BEGIN
    SELECT MAX(id) INTO maxid FROM aaa;
    ALTER SEQUENCE aaa_id_seq RESTART WITH maxid;
END;
$$ LANGUAGE plpgsql;

并有错误:

ERROR:  syntax error at or near "$1"
Line 1: ALTER SEQUENCE aaa_id_seq RESTART WITH  $1 

为什么1美元？
什么错误？

Answer 1

也许使用setval函数而不是alter sequence ... restart with？

SELECT pg_catalog.setval('aaa_id_seq'::regclass, maxid, false);