1440. Cohort first order — Sarkari Result — implementation variant 40

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

In a Sarkari Result application, implement this production problem: Find each customer's first order date. 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

Option A

DELETE FROM the_table;

Additional Explanation

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

Verified Correct Answer

Option B

SELECT customer_id,MIN(order_date) first_order_date FROM orders GROUP BY customer_id;

Additional Explanation

MIN over each customer identifies the first recorded order.

Verified

Option C

UPDATE the_table SET status='active';

Additional Explanation

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

Verified

Option D

SELECT * FROM the_table;

Additional Explanation

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