Haider Ali

SQL mein quantity * unit_price se item total milta hai, lekin poore order ka grand total chahiye toh SUM() ka use karo. Chhota sa difference, lekin analysis mein kaafi important. 👀 Tum SUM() ke bina grand total kaise nikaloge? #SQL #PostgreSQL #DataAnalytics

2 tables JOIN karna easy hai, lekin 4 tables ko ek query mein connect karna? Data Analyst banna hai toh sirf queries yaad mat karo, real data par practice karo. Tum 4 tables JOIN kar sakte ho? #SQL #PostgreSQL

Product ID 101 pehle se table mein hai. Ab same ID dobara insert ki, to PostgreSQL ne error de diya! 👀 Reason? PRIMARY KEY unique honi chahiye—duplicate nahi. SQL seekh rahe ho? Queries yaad karne ke saath errors samajhna bhi zaroori hai. #SQL #PostgreSQL

Logon ko lagta hai coder bas laptop lekar baitha rehta hai 😂💻 Par unhe kya pata, ek bug fix karte-karte kabhi apni poori life debug karni pad jaati hai. 🥲 Coder ki life easy nahi, bas errors silent hote hain! 😭💻 #CodingLife #ProgrammerLife

SQL mein INSERT query sahi hone ke baad bhi data fail ho sakta hai. 👀 Reason? Foreign Key jis customer_id ko reference kar rahi hai, woh parent table mein exist hi nahi karti. Real SQL errors ko samajhna hai, sirf queries yaad nahi karni. 💻 #SQL #PostgreSQL #DataAnalytics

SQL mein Foreign Key hata di, toh kya data delete ho jayega? 😱 DROP CONSTRAINT relationship ka rule hatata hai, table ka data nahi! SQL seekh rahe ho? Ye chhota sa concept yaad rakhna. 💻 #SQL #DataAnalytics

SQL seekh rahe ho? Toh sirf queries nahi, ek real E-Commerce database banana bhi seekho! 💻🔥 🛒 1 Database 📊 4 Tables — Customers, Orders, Products & Order Items Data Analyst journey mein practical projects hi skills ko strong banate hain. #SQL #DataAnalytics

Order ki delivery date SQL se calculate karni hai? 📦 order_date + INTERVAL '5 days' — bas itni si query se 5 din baad ki date nikaal sakte ho! 💻 SQL ke aise practical tricks Data Analyst banne mein kaam aate hain. #SQL #DataAnalytics

SQL mein pichhle 7 din ke orders nikalne hain? 👀 Bas CURRENT_DATE aur INTERVAL '7 days' ka use karo! 🔥 Data Analyst banne ke liye aise practical SQL concepts seekhna zaroori hai. 💻 #SQL #DataAnalytics

Duplicate chahiye? UNION ALL! 😎 Neha 2 baar, Rahul bhi 2 baar ✅ 6 Rows - Sab ka sab! #SQL #SQLTips

2 Table 1 me? 🤔 UNION se! Table 1 + Table 2 = 5 Unique Names ✅ Neha duplicate tha, hata diya! #SQL #Union

Sabse bada order kiska hai? 👑 Aman - 2500 💰 Subquery se 1 sec me niklega! #SQL #LearnSQL

AVG se zyada salary wale kaise nikale? 🤔 1 line ka Subquery = Game Over! WHERE salary > (SELECT AVG(salary)...) #SQL #LearnSQL

How to find customers with NO orders? LEFT JOIN Trick 👇 SELECT * FROM customers c LEFT JOIN orders o ON c.customer_id = o.customer_id WHERE o.order_id IS NULL; This is called Anti-JOIN. #SQL #100DaysOfCode

INNER JOIN hides data. LEFT JOIN shows all. That’s the difference. Most devs use INNER when they need LEFT. #SQL #SQLJoins #Coding

Stop showing NULL to clients ❌ Use: COALESCE(email, 'Not Assigned') ✅ Looks professional. Works everywhere. #SQLTips #100DaysOfCode

= NULL will ALWAYS return 0 rows. ❌ Use IS NULL instead. ✅ Most common SQL interview mistake. #19 SQL Shorts | Haider With Code

GROUP BY vs ORDER BY - Confused? 🤯 GROUP BY = GROUPS 👥 ORDER BY = SORT 📊 SELECT department, AVG(salary) AS avg_sal FROM employees GROUP BY department ORDER BY salary DESC; #SQL #GroupBy

GROUP BY Bhool Gaye? Interview GAYA! 😱 SELECT department, SUM(salary) FROM employees GROUP BY department; Result: IT=73000, HR=82000 #SQL #GroupBy

COUNT / MAX / MIN = 1 Line = 100 Kaam? 😱 SELECT COUNT(*), MAX(salary), MIN(salary) FROM employees; Result: COUNT=7, MAX=45000, MIN=30000 #SQL #SQLinHindi