PostgreSQL DML Tutorial | SELECT, WHERE, UPDATE, DELETE, GROUP BY & HAVING

Published: 27 June 2026
on channel: Swarup Kumar Saha

🚀 PostgreSQL SQL Queries:
In this practical PostgreSQL session, we work with a real-world Users table and learn the most important SQL queries used by developers, database administrators, and interview candidates.

📌 SQL Topics Covered:
✅ SELECT Statement
✅ WHERE Clause
✅ LIKE Operator
✅ ORDER BY (ASC & DESC)
✅ LIMIT & OFFSET
✅ UPDATE Statement
✅ DELETE Statement
✅ COUNT Function
✅ GROUP BY Clause
✅ HAVING Clause
✅ DISTINCT Keyword
✅ IN Operator
✅ AND / OR / NOT Conditions
✅ Aggregate Functions
✅ String Functions (UPPER, LENGTH)

📌 25 Practical SQL Queries:
✔ Display All Records
✔ Select Specific Columns
✔ Filter Buyers and Sellers
✔ Multiple Conditions using AND / OR
✔ NOT Operator
✔ IN Operator
✔ LIKE Pattern Matching
✔ Count Total Records
✔ Count Specific Roles
✔ DISTINCT Values
✔ ORDER BY ASC & DESC
✔ LIMIT & OFFSET Pagination
✔ GROUP BY Analysis
✔ HAVING with Aggregation
✔ UPDATE Records
✔ DELETE Records
✔ Latest and Oldest Records
✔ Case-Insensitive Search using ILIKE
✔ UPPER Function
✔ LENGTH Function
✔ SQL Interview-Oriented Queries

🎯 Perfect For:
✔ SQL Beginners
✔ PostgreSQL Learners
✔ Python Developers
✔ Django Developers
✔ Backend Developers
✔ Database Administrators (DBA)
✔ College Students
✔ Job Interview Preparation

💻 Database Used
PostgreSQL

📚 Table Used
users

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