Discussion
The SELECT command, with its various clauses, allows users to query the data contained in the tables and ask many different questions or ad hoc queries.
Answer: A
Correct answer: True
This is what distinguishes a relational database from the file-based systems it replaced. SELECT, with its clauses for filtering, grouping, ordering and joining, lets a user pose a question the database designer never anticipated.
That is what "ad hoc" means here: the query is composed when the question arises, not built into the application in advance. Earlier models required navigating predefined access paths, so a new question often meant new code. Declaring what is wanted rather than how to fetch it is the whole point.
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