GROUP BY in SQL Explained with Coding🔥 | WHERE vs HAVING | SQL Tutorial for Beginners with Examples
In this video, I explain GROUP BY in SQL in a simple and practical way with live coding examples.
If you are learning SQL, preparing for exams (BCA, MCA, BTech) or getting ready for interviews, this is one of the most important topics in DBMS and SQL.
00:00 – What is GROUP BY?
00:51 – Average Marks Example
02:13 – Important GROUP BY Rule ⚠️
03:12 – Multiple Columns Example
05:12 – Group By with WHERE
06:42 – Group By with WHERE
🔹 What is GROUP BY in SQL?
The GROUP BY clause is used to group rows that have the same values in one or more columns and then apply aggregate functions like:
✔ COUNT()
✔ SUM()
✔ AVG()
✔ MIN()
✔ MAX()
👉 In simple words:
GROUP BY creates categories, and aggregate functions summarize data for each category.
🔹 Why Do We Need GROUP BY?
Without GROUP BY:
Aggregate functions return only ONE result for the whole table.
With GROUP BY:
Aggregate functions return ONE result per group.
🔹 Topics Covered in This Video
✅ GROUP BY basic syntax
✅ Sample student table explanation
✅ Average marks per department
✅ Important GROUP BY rule (very important for exams & interviews)
✅ Invalid vs Correct queries
✅ GROUP BY with multiple columns
✅ GROUP BY with WHERE clause
✅ GROUP BY with HAVING clause
✅ Difference between WHERE and HAVING
🔹 Practical Coding Examples Covered
✔ Average Marks per Department
✔ Grouping by Multiple Columns
✔ Filtering Before Grouping (WHERE)
✔ Filtering After Grouping (HAVING)
✔ Real output explanation
You will clearly understand:
• How rows are grouped
• How aggregation works
• When to use WHERE
• When to use HAVING
• Common mistakes students make
🎯 Who Should Watch?
✔ SQL Beginners
✔ College Students (BCA / MCA / BTech)
✔ DBMS Learners
✔ Interview Preparation Students
✔ Anyone learning Database & SQL
If you found this helpful:
👍 Like the video
📌 Subscribe for full SQL series
#SQL #GroupBy #SQLGroupBy #SQLTutorial #LearnSQL
#DBMS #Database #DatabaseManagement #SQLForBeginners
#SQLQueries #AggregateFunctions #SQLAggregate
#AVG #COUNT #SUM #MIN #MAX
#HAVINGClause #WHEREClause #SQLWhereVsHaving
#Programming #Coding #ComputerScience
#CSStudents #BCA #MCA #BTech #EngineeringStudents
#SQLInterview #SQLInterviewQuestions
#DataAnalysis #SQLPractice #SQLExamples
#TechEducation #CodeWithMe #CodingTutorial
#SoftwareDeveloper #BackendDeveloper
#LearnCoding #ProgrammingTutorial