As a PL/SQL programmer for a large online store, you are responsible for managing the database of customer orders. The store contains various sections such as customers, products, orders, and invoices ...

--Example 1 BEGIN DBMS_OUTPUT.PUT_LINE ('Lyca'); END; --Ques: What do you think DBMS_OUTPUT.PUT_LINE does? DBMS_OUTPUT.PUT_LINE is a PL/SQL procedure that prints messages to the console or output ...

clauses IN and EXISTS are interchangeable. However, they’re quite different in how they handle NULL values and may give different results. The problem comes from the fact that, in an Oracle database, ...