1711. Count with condition — Restaurant POS — implementation variant 11

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

In a Restaurant POS application, implement this production problem: Count successful and failed payments in one result. 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

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 B

SELECT SUM(status='success') success_count,SUM(status='failed') failed_count FROM payments;

Additional Explanation

MySQL evaluates boolean expressions numerically; CASE expressions can be used when portability is more important.

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

DELETE FROM the_table;

Additional Explanation

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