Multiple choice technology databases

The number of levels of subqueries we could use in the SQL is

  1. 13

  2. 255

  3. 78

  4. 15
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D Correct answer
Explanation

DB2 imposes a practical limit on subquery nesting depth to prevent overly complex queries that would impact performance and parser complexity. The maximum allowed nesting level is 15 subqueries deep. This means you can have a query within a query within a query, up to 15 levels deep. While the other options (13, 78, 255) might seem like technical numbers, 15 is the actual documented limit in DB2 for subquery nesting. This architectural limit balances query flexibility with system manageability.

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