1326. Upsert — E-commerce — implementation variant 26

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

In a E-commerce application, implement this production problem: Insert a product or update its price and stock when the primary key already exists. 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.

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Option B

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 C

INSERT INTO products(id,name,price,stock) VALUES(:id,:name,:price,:stock) ON DUPLICATE KEY UPDATE name=VALUES(name),price=VALUES(price),stock=VALUES(stock);

Additional Explanation

MySQL upsert handles insert-or-update. Keep the primary/unique key that defines the conflict.

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.