Question 16 :
A SQL view is a virtual table that is constructed from other tables or views.
Question 17 :
There are three SQL data modification operations: insert, modify and delete.
Question 18 :
SQL statements can be embedded in triggers, stored procedures, and program code.
Question 19 :
A view that contains a computed column can be easily updated.
Question 20 :
Three types of triggers are: BEFORE, AFTER and EXCEPTION.