Teach Cloud - Cloud, DevOps, and Python Backend Development Blog

❓ Quiz Question

Aug 30, 2026

Quiz: What does the "A" in SQL ACID properties stand for?

… city guarantees that all operations within a database transaction execute successfully, or the entire transaction is rolled back completely.

#SQL & Databases #Quiz #Interactive

❓ Quiz Question

Aug 30, 2026

UNION performs a distinct deduplication pass on combined records; UNION ALL appends records directly, providing faster performance.

#SQL & Databases #Quiz #Interactive

❓ Quiz Question

Aug 30, 2026

COALESCE(val1, val2, fallback) evaluates arguments sequentially and returns the first non-null value encountered.

#SQL & Databases #Quiz #Interactive

❓ Quiz Question

Aug 30, 2026

… concurrent transactions acquire circular locks; database engines detect deadlocks and abort one of the transactions.

#SQL & Databases #Quiz #Interactive

❓ Quiz Question

Aug 30, 2026

If two rows tie for rank 1, RANK() assigns the next row rank 3, whereas DENSE_RANK() assigns rank 2.

#SQL & Databases #Quiz #Interactive

❓ Quiz Question

Aug 30, 2026

Composite Primary Keys use multiple attribute combinations (e.g. user_id, role_id ) to ensure uniqueness.

#SQL & Databases #Quiz #Interactive

❓ Quiz Question

Aug 30, 2026

In SQL LIKE queries, % matches arbitrary length substrings, while _ matches a single character.

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❓ Quiz Question

Aug 30, 2026

null=True is database-related (storing NULL values); blank=True is validation-related (allowing empty inputs in forms).

#Django Web Framework #Quiz #Interactive