Update trigger

/*EXAMPLE OF A UPDATE FUNCTION WITH TRIGGER PLPGSQL*/

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

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

/*DROP TRIGGER update_aumentarpreco ON partsupp*/
/*Testing

UPDATE
    partsupp
SET
    ps_availqty = 4
WHERE
    ps_suppkey = 2*/

Similar codes

13 votes114 views2 answers
Sql online compiler
SQL
0 vote117 views1 answer
SQLSTATE[01000]: Warning: 1265 Data truncated for column 'job_type' at row 1 (SQL: insert into
SQL
0 vote102 views2 answers
Update information in a mysql column
SQL
0 vote90 views1 answer
Output to file mysql
SQL
0 vote105 views1 answer
Mysql join same table multiple times group by
SQL
0 vote106 views1 answer
Jdbc sql connection string
SQL
0 vote114 views1 answer
SQL server datetime compare
SQL
1 vote61 views1 answer
Strict in postgres SQL
SQL
0 vote105 views1 answer
ALV GRID events
SQL
1 vote348 views1 answer
Sequence item 6 expected str instance bytes found mysql workbench
SQL