Advanced SQL
Which of the following is true concerning systems information in an RDBMS?

RDBMS store database definition information in system-created tables.
This information often cannot be updated by a user.
This information can be accessed using SQL.
All of these

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Advanced SQL
A UNION query is which of the following?

Combines the output from multiple queries and must include the same number of columns.
Combines the output from multiple queries and does not include the same number of columns.
Combines the output from no more than two queries and does not include the same number of columns.
Combines the output from no more than two queries and must include the same number of columns.

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