PostgreSQL基础整理（三）

DROP FUNCTION IF EXIST log_test();
    CREATE OR REPLACE FUNCTION log_test() RETURNS trigger AS $$
    DECLARE
    BEGIN
        RAISE NOTICE ‘TRIGGER LOG TEST‘;
        RETURN NULL;
    END;
    $$ LANGUAGE plpgsql;
    
CREATE TRIGGER log_trigger
    AFTER UPDATE on emps
    FOR EACH ROW EXECUTE Procedure log_test();
        
UPDATE emps SET salary = 8000.0 WHERE userid = 10;

    CREATE VIEW salarys AS
        SELECT userid AS id, salary AS money
        FROM emps
        WHERE salary > 1000;
    
    SELECT * FROM VIEW;