Question: 1. What is a subquery, and what are its basic characteristics? 2. What does using the key word AS do when used in a query?

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

1. What is a subquery, and what are its basic characteristics? 2. What does using the key word AS do when used in a query? 3. What does the GROUP BY function do in SQL

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