How many fundamental rules did E.F. Codd define to determine whether a database system qualifies as a true relational database management system? MCQ with Answer and Explanation
Explanation:
Atomicity follows the 'all-or-nothing' rule, ensuring that a transaction is either fully committed or completely rolled back if an error occurs.
Explanation:
A subquery (or nested query) is an inner SQL SELECT statement embedded within an outer statement (such as a WHERE, FROM, or SELECT clause).
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