PL/pgSQL的RETURN QUERY例子

create table custinfo(custid integer,callingcnt integer);
insert into custoinfo valuse(1,10),(2,6),(3,8);

CREATE OR REPLACE FUNCTION get_callingcnt(custid int)
RETURNS TABLE (
custid     int
,callingcnt int
) AS
$$
BEGIN

RETURN QUERY
SELECT t.custid
,t.callingcnt
FROM  custinfo t
WHERE t.custid = custid;

END;
$$  LANGUAGE plpgsql;

[pgsql@localhost bin]$ ./psql
psql (9.1.2)
Type "help" for help.

pgsql=# select get_callcnt(1);
get_callcnt
-------------
(1,10)
(1 row)

pgsql=# select get_callcnt(2);
get_callcnt
-------------
(2,6)
(1 row)

pgsql=# \q
[pgsql@localhost bin]$