1918. Find gaps in dates — Marketplace — implementation variant 18

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

In a Marketplace application, implement this production problem: Find dates with no orders in a generated calendar range. 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

SELECT * FROM the_table;

Additional Explanation

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

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

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 Correct Answer

Option D

WITH RECURSIVE dates AS (SELECT CAST(:start_date AS DATE) d UNION ALL SELECT d+INTERVAL 1 DAY FROM dates WHERE d<:end_date) SELECT d FROM dates d LEFT JOIN orders o ON DATE(o.order_date)=d.d WHERE o.id IS NULL;

Additional Explanation

A calendar CTE provides dates even when the fact table has no row for that date.