PostgreSQL函数返回多个结果集

可以从Postgres函数返回多个结果集,如MSsql：

CREATE PROCEDURE test

AS

SELECT * FROM first_table

SELECT * FROM second_table

自Postgresql 8.3以来,一直以来都是一个比较简单的方法.

CREATE FUNCTION test()
  RETURNS SetoF first_table AS
$func$
BEGIN

RETURN QUERY
SELECT * FROM first_table;

RETURN QUERY
SELECT * FROM second_table;   -- has to return same rowtype as first_table!

END
$func$LANGUAGE plpgsql;

呼叫：

SELECT * FROM test();

见manual on RETURN QUERY.