Question: 1. What are union-compatible data sets? I 2. What are relvars? 3. What is the difference between union and union all queries? 4. What

1. What are union-compatible data sets? I 2. What are relvars? 3.

1. What are union-compatible data sets? I 2. What are relvars? 3. What is the difference between union and union all queries? 4. What is the purpose of a view? 5. What is the difference between the usage of the set difference operation in an except/minus statement and the left outer join command?

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