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What is the difference between union and union all

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Reference no: EM131529177

Question: 1. The relational set operators UNION, INTERSECT, and EXCEPT (MINUS) work properly only when the relations are union-compatible. What does union-compatible mean, and how would you check for this condition?

2. What is the difference between UNION and UNION ALL? Write the syntax for each.

Reference no: EM131529177

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