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Reels en Tendance

(12)

#Subquery In Sql Reel by @dataxodyssey - Day 29 SQL 🔥 | Tech Company Interview Question

SAVE this and SHARE with your Data Analyst batch 📊

📺 Follow on YouTube: Link in Bio
👉 www.youtube — Day 29 SQL 🔥 | Tech Company Interview Question SAVE this and SHARE with your Data Analyst batch 📊 📺 Follow on YouTube: Link in Bio 👉 www.youtube.com/@DataXOdyssey 🚫 COMMON DATA ISSUE (VERY IMPORTANT) ❌ Duplicate rows = wrong reports ❌ Double counting users/employees ❌ Poor data quality ✅ SQL helps you identify duplicates instantly 🎯 INTERVIEW TIP (SAVE THIS) 💡 Duplicates are found using GROUP BY + HAVING 💡 Multiple columns are checked together, not separately 💡 This question is asked in almost every tech interview 👉 Interviewers test your data thinking, not just syntax. 🧠 WHAT YOU LEARN IN THIS VIDEO (Beginner Friendly) ✅ 1️⃣ Identify duplicate values SELECT name, department, position_title, COUNT(*) FROM employees GROUP BY name, department, position_title HAVING COUNT(*) > 1; 📌 Groups identical records 📌 Counts how many times they appear 📌 Shows only repeated entries 📌 REAL-WORLD MEANING If the same Name + Department + Role appears more than once, 👉 it’s treated as a duplicate record 🔥 WHY THIS MATTERS • Prevents incorrect reports • Improves data accuracy • Essential for Data Analysts SAVE this for revision 📌 SHARE with your SQL/interview buddy 🤝 Check Out Day 18: WHERE vs HAVING (must-watch) #SQLInterview #LearnSQL #DataAnalyst #TechInterviews #MySQL #DataAnalytics #CodingReels #SQLTutorial #SQLHacks

#Subquery In Sql Reel by @dataxodyssey - 🔥 Day 37: This Question HUMBLES 90% Candidates 😮‍💨

Most people answer it half right…
Interviewers notice instantly ⚠️

💾 SAVE this for SQL interv — 🔥 Day 37: This Question HUMBLES 90% Candidates 😮‍💨 Most people answer it half right… Interviewers notice instantly ⚠️ 💾 SAVE this for SQL interviews 👥 SHARE with your Data Analyst batch 📌 Follow @dataxodyssey for Daily SQL Interview Prep 🏆 INTERVIEW GOLD Subqueries test: ✔ logical thinking ✔ query layering ✔ business understanding ✔ real-world SQL usage Master this = easy interview win ❓ Interview Question Display employees whose salary is GREATER than the average salary Sounds easy? Here’s where people fail 👇 ❌ They calculate average manually ❌ They hard-code values ❌ They forget SQL should handle dynamic data 💡 INTERVIEWER EXPECTS THIS 👉 Use a SUBQUERY 👉 Let SQL calculate the average 👉 Compare salaries dynamically This works even when: ✔ salaries change ✔ new employees are added ✔ real production data grows #SQLInterview #SQLSubquery #LearnSQL #DataAnalystInterview #SQLTips #DailySQL #DataAnalystLife #TechCareers #IndianTech #AnalyticsJobs #SQLForBeginners #CareerInData #DataXOdyssey

#Subquery In Sql Reel by @dataengnotebook - Find the Median Salary - Real Interview Question

Average is easy.
Median? That's where SQL gets interesting 👀

Why?
Because SQL doesn't have a simpl — Find the Median Salary — Real Interview Question Average is easy. Median? That’s where SQL gets interesting 👀 Why? Because SQL doesn’t have a simple built-in MEDIAN() in most databases. So what do we do? 👇 ✔ Use ROW_NUMBER() ✔ Use COUNT() as window function ✔ Handle even vs odd number of rows ✔ Take the middle value (or average of two) This question tests: 🔹 Window function depth 🔹 Edge case thinking 🔹 Analytical SQL problem-solving If you can solve MEDIAN confidently, you’re already above average 🚀 #SQLInterview #WindowFunctions #AdvancedSQL #LearnSQL #DataEngineering

#Subquery In Sql Reel by @dataxodyssey - Day 40: 10 Characters ≠ 10 Bytes 😮‍💨 LENGTH vs CHAR_LENGTH

Everyone thinks name limits are SIMPLE…
Until Unicode enters the database 👀

Characters — Day 40: 10 Characters ≠ 10 Bytes 😮‍💨 LENGTH vs CHAR_LENGTH Everyone thinks name limits are SIMPLE… Until Unicode enters the database 👀 Characters ❌ Bytes ❌ Emoji ❌ Regional letters ❌ 💾 SAVE this for SQL interviews 👥 SHARE with your Data Analyst batch 📌 Follow @dataxodyssey for Daily SQL Interview Prep Interview Question A system allows employee names up to 10 characters, but the database column is limited to 10 bytes. Why does this cause errors? Which function would you use to detect risky names? Sounds basic? This is where candidates slip 👇 ❌ Common Mistakes ❌ Assuming characters = bytes ❌ Using CHAR_LENGTH for storage validation ❌ Ignoring Unicode data ❌ Learning SQL only at surface level SELECT LENGTH(employee_name) FROM employees; ✔ LENGTH checks bytes ✔ Detects Unicode overflow ✔ Prevents insert failures ✔ Production-safe logic SELECT CHAR_LENGTH(employee_name) FROM employees; 👉 Counts characters (display logic, not storage) 🎯 Why Interviewers Ask This Tests: ✔ Unicode awareness ✔ Storage vs display difference ✔ Real-world SQL thinking ✔ System design basics Simple on paper. Dangerous in production 🧠 #SQLInterview #SQLStringFunctions #SQLTips #DailySQL #DataAnalystInterview #SQLForBeginners #AdvancedSQL #AnalyticsCareers #TechCareers #IndianTech #CareerInData #DataXOdyssey

#Subquery In Sql Reel by @dataxodyssey - Day 24 SQL 🔥| This SQL NULL mistake can fail your interview ❌
IFNULL vs COALESCE explained simply.

SAVE this and SHARE with your Data Analyst batch — Day 24 SQL 🔥| This SQL NULL mistake can fail your interview ❌ IFNULL vs COALESCE explained simply. SAVE this and SHARE with your Data Analyst batch 📊 📺 Follow on YouTube: Link in Bio 👉 www.youtube.com/@DataXOdyssey ❓ Problem Your SQL results may look correct — but still be wrong ❌ When data contains NULL, calculations and reports can break… ✅ IFNULL() – Replace NULL with a default value SELECT IFNULL(Salary, 0) AS Salary FROM employees; 👉 If Salary is NULL → replace it with 0 👉 Works with only ONE fallback value ✅ COALESCE() – Pick first non-NULL value SELECT COALESCE(Salary, Bonus, 0) AS Final_Pay FROM employees; 👉 Checks values from left to right 👉 Returns the first value that is NOT NULL 👉 Can handle multiple columns 🎯 Interview Tip: Use COALESCE when multiple fallback values are possible Use IFNULL when logic is simple and limited 🧠 Understand the difference (IMPORTANT 👇) • IFNULL ✔ Simple ✔ Only 2 arguments ✔ Good when you need one replacement • COALESCE ✔ More powerful ✔ Multiple arguments ✔ Works across different SQL databases ✔ Preferred in real-world analytics 📌 This is why COALESCE is more flexible than IFNULL 📌 Part of Daily SQL Series – Day 24 🔁 Missed earlier days? Check out previous videos to learn SQL from scratch 🔁 Save this 📌 Follow for daily SQL learning 🔁 DAY SERIES FLOW 👉 Check Out Day 23: NULL vs IS NULL vs IS NOT NULL #LearnSQL #SQLTutorial #SQLTips #SQLBeginners #DataAnalytics #DataAnalystJourney #SQLInterview #TechCareers #MySQL #PostgreSQL #Day24SQL #DataXOdyssey

#Subquery In Sql Reel by @khan.the.analyst (verified account) - 🔥 Want FREE SQL resources?
Comment "SQL" 👇

You'll receive:
✔ SQL Notes (Beginner-friendly)
✔ SQL LeetCode Q&A
✔ Interview-focused SQL questions
✔ P — 🔥 Want FREE SQL resources? Comment “SQL” 👇 You’ll receive: ✔ SQL Notes (Beginner-friendly) ✔ SQL LeetCode Q&A ✔ Interview-focused SQL questions ✔ Practice sets (Basic → Advanced) These helped me crack real Data Analyst interviews. ⸻ 📞 1:1 Mentorship | Resume Review | Mock Interviews 👉 Link in Bio 💾 Save | 📤 Share | 👤 Follow @khan.the.analyst #SQL #SQLLearning #DataAnalytics #SQLInterview #careerindata

#Subquery In Sql Reel by @dataxodyssey - Not a hard question. But it filters weak SQL fundamentals instantly.

Know:
✔ Date functions
✔ GROUP BY
✔ COUNT

Save this for your next interview. Fo — Not a hard question. But it filters weak SQL fundamentals instantly. Know: ✔ Date functions ✔ GROUP BY ✔ COUNT Save this for your next interview. Follow @dataxodyssey for daily learnings #SQL #SQLInterview #DataAnalyst #LearnSQL #DataEngineer #TechCareers #Database #Analytics #dataxodyssey

#Subquery In Sql Reel by @cloudydata.ajay (verified account) - Be honest 👇
How many of these SQL interview questions can you solve?

Comment your number.
(Save this - you'll thank yourself before interviews.)

Co — Be honest 👇 How many of these SQL interview questions can you solve? Comment your number. (Save this — you’ll thank yourself before interviews.) Comment SQL to get this complete PDF in your DM 📥 Follow @cloudydata.ajay for Analytics, SQL & data interview practice Tags : #sqlinterview #sqlpractice #dataanalytics #datascience #interviewprep

#Subquery In Sql Reel by @dataxodyssey - Day 45 | CURDATE vs CURRENT_DATE & NOW vs CURRENT_TIMESTAMP

💾 SAVE this for SQL interviews
👥 SHARE with your PEERS

📌 Follow @dataxodyssey for Dai — Day 45 | CURDATE vs CURRENT_DATE & NOW vs CURRENT_TIMESTAMP 💾 SAVE this for SQL interviews 👥 SHARE with your PEERS 📌 Follow @dataxodyssey for Daily SQL Interview Prep Dates look SIMPLE. But interviews test your precision REMEMBER THIS • CURDATE & NOW → MySQL flavor • CURRENT_DATE & CURRENT_TIMESTAMP → SQL standard #SQL #MySQL #LearnSQL #SQLInterview #SQLTips #DataAnalyst #DataAnalytics #AnalyticsCareers #TechCareers #DailySQL #SQLTricks #SQLForBeginners #AdvancedSQL #DataXOdyssey

#Subquery In Sql Reel by @codemeetstech (verified account) - This is a basic but tricky DSA interview question.

Why is insertion faster in a linked list than in an array?

1️⃣ Array needs shifting
When you inse — This is a basic but tricky DSA interview question. Why is insertion faster in a linked list than in an array? 1️⃣ Array needs shifting When you insert an element in the middle of an array, all elements after that position must shift. Example: Insert at index 2 → elements move right. Time complexity: O(n) 2️⃣ Linked list only updates pointers In a linked list, you just change the next pointer. Example: A → B → C Insert D after B A → B → D → C No shifting required. Time complexity: O(1) (if position known) 3️⃣ Memory layout difference Arrays store elements in contiguous memory. Linked lists store elements scattered in memory with pointers. 🎯 Interview takeaway Array insertion → move many elements Linked list insertion → update pointers Pointer change is cheaper than shifting data. { DataStructures, Algorithms, Coding, Programming, SoftwareDevelopment, ComputerScience, DSA, BackendDeveloper, LearnToCode, TechCareers } #DataStructures #Algorithms #Coding #ComputerScience #TechExplained

#Subquery In Sql Reel by @dataxodyssey - Day 53 | RIGHT JOIN Explained Simply

Yesterday we kept all employees.
Today we keep all salaries.

Same tables.
Different logic.

This is where inter — Day 53 | RIGHT JOIN Explained Simply Yesterday we kept all employees. Today we keep all salaries. Same tables. Different logic. This is where interviews eliminate candidates. Understand JOIN direction. Don’t memorize it. SAVE this and SHARE with your SQL batch Follow @dataxodyssey for complete series SELECT e.employee_id, e.employee_name, s.salary FROM employees e RIGHT JOIN salary s ON e.employee_id = s.employee_id; ✅ All records from RIGHT table + ✅ Matching records from LEFT table Meaning: • Salary exists → WILL appear • Employee exists → will show • Employee missing → shows NULL Important Difference INNER JOIN → Only matching rows LEFT JOIN → Keep all LEFT table rows RIGHT JOIN → Keep all RIGHT table rows #SQL #SQLInterview #AdvancedSQL #DataAnalystInterview #SQLTips #DailySQL #AnalyticsJobs #TechCareers #SQLForBeginners #CareerInData #DataXOdyssey #ReelItFeelIt #LearnSQL #Database #DataEngineer #TechJobs #SQLHacks #SQLTutorial

#Subquery In Sql Reel by @dataxodyssey - Day 36: Most SQL learners get this WRONG in interviews

They say "Top 3 employees by salary"
But forget ONE critical detail 👇

👉 What if multiple em — Day 36: Most SQL learners get this WRONG in interviews They say “Top 3 employees by salary” But forget ONE critical detail 👇 👉 What if multiple employees have the SAME salary? Interviewers WANT you to think about ties. ❓ Interview Question Retrieve Top 3 employees by salary in each department ✔ department-wise ✔ highest salary first ✔ include employees with same salary If you use ROW_NUMBER() ❌ — you’ll miss people. INTERVIEW GOLD 🏆 Use DENSE_RANK() with PARTITION BY. This is how real analysts: ✔ avoid unfair filtering ✔ handle real-world data ✔ write production-ready SQL 💾 Save this for interviews 👥 Share with your SQL batch Follow @dataxodyssey for daily SQL interview prep 🚀 #SQLInterview #TopNSQL #WindowFunctions #DENSE_RANK #LearnSQL #DataAnalystLife #TechInterviews #DailySQL #IndianTech #SQLTips

✨ Guide de Découverte #Subquery In Sql

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#Subquery In Sql est l'une des tendances les plus engageantes sur Instagram en ce moment. Avec plus de thousands of publications dans cette catégorie, des créateurs comme @khan.the.analyst, @cloudydata.ajay and @dataxodyssey mènent la danse avec leur contenu viral. Parcourez ces vidéos populaires anonymement sur Pictame.

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