Discussion
SQL provides the AS keyword, which can be used to assign meaningful column names to the results of queries using the SQL built-in functions.
Answer: A
Correct answer: True
AS assigns an alias, and it is particularly useful with aggregates, whose default column names are the expressions themselves - COUNT(*) or worse. SELECT COUNT(*) AS order_count gives the result a name a program or a report can use.
It also aliases tables, as in FROM customer AS c, which is what makes a self-join possible. The keyword is optional in most dialects for both purposes, but writing it makes the intent explicit and avoids a missing comma silently becoming an alias.
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