/SQL/Cannot return non-composite value from function that returns composite type

Cannot return non-composite value from function that returns composite type

--EXAMPLE OF A UPDATE FUNCTION WITH TRIGGER PLPGSQL

CREATE OR REPLACE FUNCTION update_aumentarpreco ()
    RETURNS TRIGGER
    LANGUAGE PLPGSQL
    AS 
    $BODY$
BEGIN
    IF NEW.ps_availqty = 2 THEN
        NEW.ps_supplycost = OLD.ps_supplycost * 0.10;
        RETURN NEW;
    END IF;
    RETURN NULL;
END;
$BODY$ 

CREATE TRIGGER update_aumentarpreco
    BEFORE UPDATE OF ps_availqty ON partsupp
    FOR EACH ROW
    EXECUTE PROCEDURE update_aumentarpreco ();

Similar codes

2 votes185 views1 answer
Oracle table size
SQL
1 vote194 views1 answer
Return size of tables in mysql
SQL
1 vote207 views1 answer
Oracle select row max date
SQL
0 vote208 views3 answers
Joins and views sql
SQL
0 vote194 views1 answer
Mysql select inside sum
SQL
0 vote210 views1 answer
Array aggre distinct postgres
SQL
0 vote198 views1 answer
Contact mysql column field
SQL
4 votes256 views1 answer
Oracle table statistics
SQL
0 vote236 views1 answer
Sql query to select even numbers
SQL
0 vote213 views1 answer
How to remove quotes from a string in ssis load file
SQL