Question 16 :
Oracle commands, column names, table names, view names and all other database elements are case sensitive.
Question 17 :
If there is only one statement and no ambiguity about what is wanted, Oracle will treat the semicolon and slash as the same.
Question 18 :
The only time that case matters is inside quotation marks of strings.
Question 19 :
You can use the DROP statement to remove structures from the database.
Question 20 :
Oracle, the world's most popular DBMS, is powerful and robust, running on many different operating systems.