PL/pgSQL多输出参数例子

例子一，不带returns:

postgres=# CREATE FUNCTION sum_n_product(x int, y int, OUT sum int, OUT prod int) AS $$
postgres$# BEGIN
postgres$#     sum := x + y;
postgres$#     prod := x * y;
postgres$# END;
postgres$# $$ LANGUAGE plpgsql;
CREATE FUNCTION
postgres=#
postgres=# select sum_n_product(3,4);
 sum_n_product
---------------
 (7,12)
(1 row)

例子二，带returns:

postgres=# CREATE FUNCTION sum_n_product2(x int, y int, OUT sum int, OUT prod int) returns record AS $$
postgres$# BEGIN
postgres$#     sum := x + y;
postgres$#     prod := x * y;
postgres$# END;
postgres$# $$ LANGUAGE plpgsql;
CREATE FUNCTION
postgres=#
postgres=# select sum_n_product2(3,4);
 sum_n_product2
----------------
 (7,12)
(1 row)

postgres=#