Discussion
Which of the following is true concerning systems information in an RDBMS?
Answer: D
Correct answer: All of the above.
The catalogue is itself held as tables, so it can be queried with ordinary SELECT statements - which is how a developer discovers what columns a table has. It is maintained by the system in response to DDL, so it is not directly updatable; altering it by hand would leave the database inconsistent with itself.
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