Aggregate Functions in SQL | DBMS | Kerala PSC | Computer Programmer, System Analyst, System Manager

🖥️ DBMS | Aggregate Functions in SQL Explained | Malayalam | Kerala PSC (KPSC) | Computer Programmer | System Analyst | Database Administrator | COMPUTER PROGRAMMER -CUM-OPERATOR | System Manager | System Administrator

In this video, we dive into the most commonly used SQL features—Aggregate Functions along with the GROUP BY and HAVING clauses. These are not only essential for real-world data analysis but are also heavily tested in Kerala PSC exams for roles like Computer Programmer, DBA, and System Analyst.

📌 What You’ll Learn in This Video:

✅ SQL Aggregate Functions Explained with Examples

COUNT() – To count rows

SUM() – To total numeric values

AVG() – To calculate average

MIN() & MAX() – To find smallest and largest values

✅ GROUP BY Clause
• Used to group rows that have the same values
• How to use GROUP BY with COUNT, SUM, etc.
• Syntax and practical demo in Malayalam

✅ HAVING Clause
• Difference between WHERE and HAVING
• Used to filter groups after aggregation
• Examples with COUNT(), SUM(), and AVG()

✅ PSC-Oriented Focus
• Malayalam explanation with real-world use cases
• Kerala PSC model questions based on SQL
• Quick tips to remember syntax and logic
• Output prediction-type questions covered

📚 Why It’s Important?
SQL aggregate queries are frequently asked in Kerala PSC technical papers under DBMS sections. Knowing how to use GROUP BY and HAVING helps crack many query-based MCQs.

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