SQL Learning Path

Learn SQL: Queries, Joins, Window Functions and Tuning

Every developer, analyst and tester gets tested on SQL. This path goes from SELECT and joins to aggregation, subqueries, window functions, indexing and transactions — each with runnable queries and the interview questions the topic unlocks.

11 Tutorials
10 Topic Clusters
Beginner
Free Learning

SQL Roadmap

Follow the Path in Order

Basics 2 tutorials

What SQL is, relational basics, and creating tables.

beginnerCREATE TABLE in SQLA hands-on guide to CREATE TABLE in SQL, covering data types, primary and foreign keys, and constraints that keep your data correct from day one.6 min read beginnerWhat Is SQL?A plain-English introduction to SQL: what it is, how relational tables work, and the first queries you should be able to write and read.6 min read

Querying Data 1 tutorials

Filter, sort and shape result sets.

beginnerThe SELECT Statement in SQLThe SELECT statement is the workhorse of SQL. Learn to pick columns, filter rows, sort results, and control how much data comes back.6 min read

Joins 1 tutorials

Combine rows across tables the right way.

beginnerSQL Joins ExplainedJoins connect rows across tables. Learn INNER, LEFT, RIGHT and FULL joins with a shared employees and departments schema and know exactly when to use each.7 min read

Aggregation 1 tutorials

Summarize data with GROUP BY and aggregate functions.

beginnerGROUP BY in SQLGROUP BY turns rows into summaries. Learn to aggregate with COUNT, SUM and AVG, filter groups with HAVING, and avoid the classic grouping errors.6 min read

Subqueries 1 tutorials

Queries inside queries, and when a JOIN is better.

beginnerSubqueries in SQLA subquery is a query inside a query. Learn scalar, IN, EXISTS and correlated subqueries, and when a subquery beats a join for clarity.6 min read

Window Functions 1 tutorials

Ranking and running totals without collapsing rows.

beginnerSQL Window Functions IntroductionWindow functions rank rows and compute running totals without collapsing your data. Learn OVER, PARTITION BY, ROW_NUMBER and RANK from scratch.6 min read

Indexes & Performance 1 tutorials

Make slow queries fast and read a query plan.

beginnerSQL Indexes ExplainedUnderstand how SQL indexes turn full-table scans into fast lookups, when to create them, and the common mistakes that stop indexes from being used.6 min read

Transactions 1 tutorials

ACID, isolation levels and safe concurrent writes.

beginnerSQL Transactions ExplainedLearn how SQL transactions group statements into all-or-nothing units, what ACID really means, and how COMMIT, ROLLBACK, and isolation levels keep data correct.6 min read

Database Design 1 tutorials

Normalization and modelling data that lasts.

beginnerDatabase NormalizationA practical walk through 1NF, 2NF, 3NF and BCNF using an employees and orders schema, showing how normalization removes redundancy and update anomalies.7 min read

Interview Queries 1 tutorials

The query puzzles interviewers actually give.

beginnerSQL Interview Questions and AnswersA hands-on study guide to the SQL interview questions freshers face most, with runnable queries on an employees and orders schema you can practice today.6 min read

Continue Your Preparation

SQL Interview PreparationTopic-wise and experience-level question sets with answers.Developer Roadmaps & Career GuidesSkills, timelines and milestones for the roles you are targeting.Technology ComparisonsHonest side-by-side guides to help you choose what to learn.Java Full Stack ProgramCodeBegun's 145-day project-based program in Madhapur, Hyderabad.