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❓ Quiz Question

Aug 30, 2026

Quiz: What does the LIKE operator with wildcard `%` perform in SQL string queries?

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

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📝 Tutorial · Backend

Oct 28, 2026 69

Architecting a Production Multi-Gateway E-Commerce Platform with Tri-Lingual LTR/RTL Localization

… PDF invoicing in Python.** --- ### 👨‍💻 Engineering & System Metadata * **Designed & Engineered by:** [Dilshad Abdulla](https://github.com/DilshadGit) — Senior Software Engineer & System …

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❓ Quiz Question

Aug 30, 2026

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

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

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❓ Quiz Question

Aug 30, 2026

Quiz: Which SQL window function assigns a unique sequential integer to rows within a partition starting at 1?

ROW_NUMBER() generates a strictly incremental sequence number for each row inside a window partition.

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❓ Quiz Question

Aug 30, 2026

Quiz: What is the outcome of a SQL ROLLBACK statement during a transaction?

ROLLBACK reverts database modifications made since the last BEGIN TRANSACTION point.

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❓ Quiz Question

Aug 30, 2026

Quiz: How does UNION differ from UNION ALL in SQL query execution?

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

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❓ Quiz Question

Aug 30, 2026

Quiz: What does a COALESCE() function return in SQL queries?

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

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❓ Quiz Question

Aug 30, 2026

Quiz: What is a SQL Deadlock?

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

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