Discussion
You have run an SQL statement that asked the DBMS to display data in a table named USER_TABLES. The results include columns of data labeled "TableName," "NumberOfColumns" and "PrimaryKey." You are looking at ________.
Answer: B
Correct answer: metadata
USER_TABLES describes the structure of the database - table names, column counts, keys - not the data the organisation stores. That is metadata, kept in the system catalogue and queryable with ordinary SQL, which is exactly what makes a database self-describing.
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