Question: What does it mean for two tables to be union compatible? 9. How do you use the ALL operator with a subquery? 10. How do

What does it mean for two tables to be union compatible?

9. How do you use the ALL operator with a subquery?

10. How do you use the ALL operator with a subquery? 

14. What is the formal name for the product of two tables? How do you form a product in SQL?

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