INSERT INTO STATION VALUES (13, 'Phoenix', 'AZ', 33, 112);
INSERT INTO STATION VALUES (44, 'Denver', 'CO', 40, 105);
INSERT INTO STATION VALUES (66, 'Caribou', 'ME', 47, 68);

SELECT ProductID, Purchasing.Vendor.BusinessEntityID, Name
FROM Purchasing.ProductVendor JOIN Purchasing.Vendor
    ON (Purchasing.ProductVendor.BusinessEntityID = Purchasing.Vendor.BusinessEntityID)
WHERE StandardPrice > $10
  AND Name LIKE N'F%'
GO\


CREATE OR REPLACE TRIGGER display_salary_changes
BEFORE DELETE OR INSERT OR UPDATE ON customers
FOR EACH ROW
WHEN (NEW.ID > 0)
DECLARE
   sal_diff NUMBER;
BEGIN
   sal_diff := :NEW.salary  - :OLD.salary;
   dbms_output.put_line('Old salary: ' || :OLD.salary);
   dbms_output.put_line('New salary: ' || :NEW.salary);
   dbms_output.put_line('Salary difference: ' || sal_diff);
END;
/