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Coding girlπŸ€—

Coding girlπŸ€—

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Learn Coding and programming language latest update tech.

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βœ… *Core SQL Interview Questions With Answers - Part 4* πŸ–₯️ 31 What are SQL Views - Virtual tables based on query results - Simplify complex queries - Example: CREATE VIEW high_earners AS SELECT * FROM employees WHERE salary > 50000; 32 What is a Stored Procedure - Pre-compiled SQL code block - Reusable, reduces network traffic - Example: CALL GetEmployeeReport(1001); 33 What are SQL Triggers - Auto-execute on events (INSERT, UPDATE, DELETE) - Enforce business rules automatically - Example: Trigger to log salary changes; 34 Difference between DELETE and TRUNCATE - DELETE removes specific rows, logs each - TRUNCATE removes all rows, faster, no logging - DELETE can use WHERE; TRUNCATE cannot; 35 What is ACID property - Atomicity: All or nothing - Consistency: Valid state always - Isolation: Transactions independent - Durability: Committed data persists; 36 What is Normalization - Organize data to reduce redundancy - 1NF, 2NF, 3NF levels - Example: Split customer and address tables; 37 What is Denormalization - Add redundancy for read performance - Used in data warehouses - Trade-off: faster queries vs storage; 38 What are Transactions - Group of operations as single unit - BEGIN TRANSACTION, COMMIT, ROLLBACK - Example: Bank transfer (deduct + credit); 39 What is an Index Scan vs Seek - Scan: reads entire index/table - Seek: directly finds rows (faster) - Use covering indexes for best performance; 40 Interview tip you must remember - Draw ER diagrams for relationships - Always mention when to use views vs temp tables - Practice EXPLAIN ANALYZE for query optimization *Double Tap ❀️ For Part 5*

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βœ… Top Platforms to Practice Coding for Beginners πŸ§‘β€πŸ’»πŸš€ 1️⃣ LeetCode – Best for Data Structures & Algorithms – Ideal for interview prep (easy to hard levels) 2️⃣ HackerRank – Practice Python, SQL, Java, and 30 Days of Code – Also covers AI, databases, and regex 3️⃣ Codeforces – Great for competitive programming – Regular contests & strong community 4️⃣ Codewars – Solve "Kata" (challenges) ranked by difficulty – Clean interface and fun challenges 5️⃣ GeeksforGeeks – Tons of articles + coding problems – Covers both theory and practice 6️⃣ Exercism – Mentor-based feedback – Clean challenges in over 50 languages 7️⃣ Project Euler – Math + programming-based problems – Great for logical thinking 8️⃣ Replit – Write and run code in-browser – Build mini-projects without installing anything 9️⃣ Kaggle (for Data Science) – Practice Python, Pandas, ML, and join competitions πŸ”Ÿ GitHub – Explore open-source code – Contribute, learn, and build your portfolio πŸ’‘ Tip: Start with easy problems and stay consistent β€” 1 problem a day beats 10 in one day.
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