1745. Daily active users — Chat Application — implementation variant 45

DBMS Published 30 Sept 2026 Updated 30 Sept 2026 0 Views Verified

In a Chat Application application, implement this production problem: Count distinct customers who placed an order each day. The API/service receives user input and must return or modify data safely. Give the SQL solution, explain why it works, and show how the same operation is called from the selected stack.

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Answer & Explanation

4 Answers

Verified Correct Answer

Option A

SELECT DATE(order_date) day,COUNT(DISTINCT customer_id) active_customers FROM orders GROUP BY DATE(order_date) ORDER BY day;

Additional Explanation

COUNT(DISTINCT) prevents multiple orders by one customer on one day from inflating the metric.

Verified

Option B

DELETE FROM the_table;

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.

Verified

Option C

SELECT * FROM the_table;

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.

Verified

Option D

UPDATE the_table SET status='active';

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.