1st lesson free
Varun kumar
- Rate 103 BWP
- Response 1h
103 BWP/hr
Contact
1st lesson free
- PostgreSQL
Beginner-Friendly SQL Classes: Learn Queries, Joins and Window Functions Step by Step with Real-Life
- PostgreSQL
Lesson location
About Varun kumar
Hi, I'm Varun Harsh, a data analytics professional based in Bengaluru. I hold a B.Tech in Computer Science and Engineering from Chandigarh University, and I work with SQL, Power BI (DAX and Power Query), Python (Pandas and NumPy) and Advanced Excel.
I started my career in sales and business development, with roles at Learning Lab Research Institute, Vyapar Apps and 99acres.com, before moving into data analytics. Because of that, I understand both sides: how businesses use data to make decisions, and how a beginner feels when starting SQL from zero. I teach with real business problems, such as finding top customers, tracking monthly growth and removing duplicate records, so that concepts make sense and stay with you.
My teaching approach
Simple explanations first, then examples on sample tables
Real-life problems and interview-style questions in every topic
Honest feedback on your queries, with practice tasks to follow up
A pace that fits you, whether you're a complete beginner or preparing for an interview next week
See more
About the lesson
- Primary
- Junior Secondary
- Secondary School
- +20
levels :
Primary
Junior Secondary
Secondary School
Première
Standard 7
Diploma
Supérieur
Adult Training
Bachelor's Degree
Master's Degree
Diplomgrad
Doctorate
Other
GDL
Qualified Lawyer Transfer Scheme
MBA
Early Childhood education
Beginner
Intermediate
Advanced
Professional
Others
Children
- English
All languages in which the lesson is available :
English
Want to learn PostgreSQL and use it confidently at work or in interviews? These classes are practical, beginner-friendly and focused on real problem solving, not just theory.
What you will learn
Database basics: tables, keys, data types and constraints
Writing queries with SELECT, WHERE, ORDER BY, LIMIT and OFFSET
Aggregations with GROUP BY and HAVING
All types of JOINs, subqueries and CTEs
Window functions such as ROW_NUMBER, RANK, LAG and running totals
CASE, NULL handling, date and string functions
INSERT, UPDATE, DELETE, transactions, indexes and query optimization
How the classes work
Every topic is explained in simple language, followed by examples on sample tables
Real-life business problems, such as top customers, monthly growth and duplicate records
Interview-style questions with feedback on your answers
Practice tasks after each session, plus [mock interviews on request]
Who it is for
Beginners starting SQL from zero
Students and freshers preparing for data analyst interviews
Working professionals moving into data analytics
See more
Rates
Rate
- 103 BWP
Pack prices
- 5h: 515 BWP
- 10h: 1030 BWP
free lessons
The first free lesson with Varun kumar will allow you to get to know each other and clearly specify your needs for your next lessons.
- 1hr
online
- 103 BWP/h
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