To sort cellular numbers by the carrier of the called number and compute the total call durations, which operation should you perform?

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Multiple Choice

To sort cellular numbers by the carrier of the called number and compute the total call durations, which operation should you perform?

Explanation:
When you want totals per category, you use aggregation with GROUP BY. Grouping by Carrier creates a separate group for each carrier, and applying SUM(Duration) adds up all the durations within each group. The result is a table that shows each carrier once, with the total call duration for that carrier. If you also want the results arranged in order by carrier, you can apply an ORDER BY Carrier after the grouping. The other options don’t produce per-carrier totals: ordering alone doesn’t aggregate durations; joining would combine datasets without producing the per-carrier sums; and filtering by carrier would exclude data rather than sum durations across all records.

When you want totals per category, you use aggregation with GROUP BY. Grouping by Carrier creates a separate group for each carrier, and applying SUM(Duration) adds up all the durations within each group. The result is a table that shows each carrier once, with the total call duration for that carrier. If you also want the results arranged in order by carrier, you can apply an ORDER BY Carrier after the grouping.

The other options don’t produce per-carrier totals: ordering alone doesn’t aggregate durations; joining would combine datasets without producing the per-carrier sums; and filtering by carrier would exclude data rather than sum durations across all records.

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