Question: 1. a.What is a subquery, and what are its basic characteristics?. b. What does using the key word AS do when used in a query?

1. a.What is a subquery, and what are its basic characteristics?.

1. a.What is a subquery, and what are its basic characteristics?. b. What does using the key word AS do when used in a query? c. What does the GROUP BY function do in SQL

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