45. CHECK

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

Prevent negative product prices in MySQL 8.0+.

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Answer & Explanation

4 Answers

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Option A

CHECK price > table;

Additional Explanation

This option is incorrect for the stated requirement.

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Option B

FOREIGN KEY (price) REFERENCES prices(id);

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option C

ALTER TABLE products ADD CONSTRAINT chk_product_price CHECK (price >= 0);

Additional Explanation

Correct implementation. Prefer parameterized queries in application code, validate affected rows for UPDATE/DELETE, and use transactions for related writes.

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Option D

UNIQUE (price >= 0);

Additional Explanation

This option is incorrect for the stated requirement.