Deutsch
SQL Brain
Melden

SQL Brain

@SQLBrainDaily

🧠 Learn SQL. Think Like a Data Pro. 📌 Daily SQL Tips & Queries 💡 SQL Concepts | Interview Questions 🎯 Beginner → Advanced Follow @SQLBrainDaily and level

  • India
  • Beigetreten
17 Gefolgt2 Follower65 Beiträge
  1. SQL Brain@SQLBrainDaily
    🧠 Welcome to SQL Brain! Learn SQL. Build skills. Think like a Data Pro. Here you'll find: ▸ SQL tips & queries ▸ SQL concepts made simple ▸ Interview questions ▸ SQL challenges ▸ Beginner → Advanced Follow @SQLBrainDaily 🚀 Let's master SQL, one query at a time.
    000247
  2. SQL Brain@SQLBrainDaily
    Answer: Option C) ✅ Joining before filtering makes the engine process many unneeded rows. Filter first, then join. A, B and D all reduce work.
    SQL Brain @SQLBrainDaily
    SQL Interview Challenge Joining a huge sales table with a store table. What's MOST LIKELY to slow the query? A) Filtering sales rows early B) Selecting only needed columns C) Joining before filtering D) Using a proper join condition Reply A, B, C or D 👇 #SQL
    00011
  3. SQL Brain@SQLBrainDaily
    SQL Interview Challenge Joining a huge sales table with a store table. What's MOST LIKELY to slow the query? A) Filtering sales rows early B) Selecting only needed columns C) Joining before filtering D) Using a proper join condition Reply A, B, C or D 👇 #SQL
    00028
  4. SQL Brain@SQLBrainDaily
    Common SQL mistake 🚫 WHERE COUNT(*) > 1 This fails. WHERE runs before grouping, so aggregates don't exist yet. Use HAVING: SELECT student, COUNT(*) FROM attempts GROUP BY student HAVING COUNT(*) > 1; #SQL
    00010
  5. SQL Brain@SQLBrainDaily
    Can you crack this SQL output? 🧠 Table: orders id | amount 1 | 100 2 | 200 3 | NULL 4 | 300 SELECT AVG(amount) FROM orders; What's the output? A) 150 B) 200 C) 120 D) 600 Comment your answer before checking 👇 #SQL
    10287
  6. SQL Brain@SQLBrainDaily
    Can you crack this SQL output? 🧠 Table: users id | email 1 | a@x.com 2 | NULL 3 | b@x.com 4 | NULL 5 | c@x.com SELECT COUNT(email) FROM users; What's the output? A) 5 B) 3 C) 2 D) 0 Comment your answer before checking 👇 #SQL
    10268
  10. SQL Brain@SQLBrainDaily
    SQL Quiz 🧠 What does this query return? SELECT DISTINCT department FROM Employees; A) All employees B) Unique departments C) Duplicate departments D) Number of departments 👇 Comment your answer! #SQL #SQLQuiz #SQLChallenge
    00017
  11. SQL Brain@SQLBrainDaily
    SQL Quiz 🧠🔥 What does this query count? SELECT COUNT(salary) FROM Employees; A) All employees B) Employees with a salary value C) Employees with NULL salary D) Total salary 👇 Comment your answer! #SQL #SQLQuiz #SQLChallenge
    00017
  12. SQL Brain@SQLBrainDaily
    SQL Subquery Challenge 🧠 What does this query find? SELECT product_id, sales FROM Orders WHERE sales > (SELECT AVG(sales) FROM Orders); A) Equal to average B) Below average C) Above average D) Highest sales 👇 Comment your answer! #SQL #SQLQuiz #SQLChallenge
    10127
  17. SQL Brain@SQLBrainDaily
    🙏 गणपती बाप्पा मोरया! 🐘❤️ May Lord Ganesha bring wisdom, success & new beginnings. ✨ Just like SQL, solve every challenge one step at a time. 💻🧠 Wishing everyone a very Happy Ganesh Chaturthi! 🙏 𝕏 Follow @SQLBrainDaily 🚀 #GanpatiBappaMorya #GaneshChaturthi #SQL
    Herunterladen
    00354
  19. SQL Brain@SQLBrainDaily
    🧠 Can you spot the mistake? SELECT name, salary FROM employees WHERE salary > 50000 GROUP BY name; ❓ Will this query work? A) Yes B) No C) Depends on the database 👇 Comment your answer. #SQL #SQLChallenge
    00047
  20. SQL Brain@SQLBrainDaily
    🧠 SQL Challenge #1 What will this query return? SELECT COUNT(*) FROM employees WHERE salary > 50000; A) Total employees B) Employees earning > 50K C) Highest salary D) Average salary 👇 Answer before checking! #SQL #SQLChallenge
    00049