Problem
i. Define and explain UNION in your own words and give one example in ORACLE SOL commands.
ii. Define and explain UNION ALL in your own words and give one example in ORACLE SOL commands.
iii. Define and explain lNTERSECT in your own words and give one example in ORACLE SOL commands.
iv. Define and explain MINUS in your own words and give one example in ORACLE SQL commands.