Interactive Lesson
Introduction to SQL
Learn the fundamentals of Structured Query Language using an Employee Management System database
Sqlism's Interactive SQL academy
Write the query that gets you hired.
A hands-on SQL learning cockpit with lessons, challenges, interview prep, quizzes, and tools built around real database work.
55SQL lessons
Livequery runner
Zerosetup needed
Structured learning paths for 16 roles — from Business Analyst to AI / LLM Data Engineer, plus a campus placement track for freshers — pick yours below.
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Free SQL Skill Check
Know exactly where you stand in SQL, in 15 minutes.
An adaptive test that gets harder when you're right and easier when you're not. You finish with a skill map across 12 core SQL skills and a study plan that tells you what to learn next, linked straight to Sqlism lessons and tools.
- 12skills measured
- 36adaptive questions
- 1personal study plan
- SELECT & Sorting
- Filtering (WHERE)
- NULL Handling
- Joins
- Aggregation
- Subqueries
- CASE & Functions
- CTEs
- Window Functions
- DML & Transactions
- Data Modelling
- Performance
Sample result
60/100 · Intermediate
Your study plan
- 1 NULL Handling 35
- 2 Window Functions 25
- 3 Subqueries 55
Choose your path
Learn SQL for the job you want
Same fundamentals, different destination. Pick a track curated for how you'll actually use SQL day to day.
Become a Business Analyst
Reporting queries, KPI rollups, and the joins behind every dashboard.
Reporting
KPI Rollups
Joins
$70K–$110Kavg. US salary
Start this path
Become a Data Analyst
Window functions, cohort analysis, A/B tests, and the patterns analysts live in.
Window Functions
Cohort Analysis
A/B Tests
$59K–$98Kavg. US salary
Start this path
Become a Data Engineer
Schema design, indexes, transactions, and building pipelines that hold up.
Schema Design
Indexes
Pipelines
$86K–$137Kavg. US salary
Start this path
Become a Data Scientist
Statistics, percentiles, feature-engineering window functions, and model-ready datasets.
Statistics
Percentiles
Feature Engineering
$97K–$150Kavg. US salary
Start this path
Become a Database Administrator
Constraints, indexes and execution plans, transactions, privileges, and operational SQL.
Execution Plans
Privileges
Transactions
$70K–$115Kavg. US salary
Start this path
Become a Backend Developer
Safe CRUD, injection prevention, JOINs, transactions, and performance for real APIs.
Safe CRUD
Injection Prevention
Performance
$75K–$136Kavg. US salary
Start this path
Become a BI Developer
Time-series functions, window functions, pivoting, and star-schema dashboard modeling.
Time-Series
Pivoting
Star Schema
$91K–$138Kavg. US salary
Start this path
Become a Product Manager
Self-serve filtering, basic KPIs, safe JOINs, and the pitfalls that produce wrong numbers.
Self-Serve Queries
KPIs
Common Pitfalls
$88K–$136Kavg. US salary
Start this path
Become an Analytics Engineer
Modular SQL, star-schema marts, SCD snapshots, incremental models and tested, documented pipelines.
Data Modeling
Data Tests
CI/CD
$106K–$147Kavg. US salary
Start this path
Become a Data QA / ETL Test Engineer
Profiling, source-to-target mapping checks, reconciliation and regression testing for data pipelines.
Reconciliation
Mapping Validation
Test Automation
$74K–$131Kavg. US salary
Start this path
Become a Financial / FP&A Analyst
P&L rollups, fiscal calendars, YoY and YTD, budget vs actual variance and ledger tie-outs.
Variance Analysis
YoY / YTD
Reconciliation
$102K–$148Kavg. US salary
Start this path
Become a Marketing / Growth Analyst
Funnels, cohort retention, sessions, A/B tests, segmentation and channel attribution.
Funnels
Cohorts
A/B Testing
$58K–$98Kavg. US salary
Start this path
Become a Cloud Data Engineer (Snowflake)
Loading, JSON with VARIANT, Time Travel, performance and cost tuning, streams, tasks and security.
Snowflake
Cost Tuning
Streams & Tasks
$87K–$127Kavg. US salary
Start this path
Become an AI / LLM Data Engineer
Text prep and chunking, vector search in SQL, RAG retrieval, LLM functions and safe text-to-SQL.
Vector Search
RAG
Text-to-SQL
$112K–$153Kavg. US salary
Start this path
Become a Healthcare Data Analyst
Encounters and claims data, ICD-10 cohorts, length of stay, readmissions and privacy-aware SQL.
Readmissions
Patient Cohorts
Privacy
$66K–$115Kavg. US salary
Start this path
Crack Campus Placements
Core queries, joins, window functions, classic placement questions and DBMS theory for freshers.
Freshers
Interview Classics
DBMS Theory
$53K–$95Kjunior analyst, US
Start this path
Salary ranges show average US base pay reported by Glassdoor (Aug–Oct 2026) for each role, and will vary by experience, location, company, and industry. Closest Glassdoor job titles used where needed: ETL Tester, FP&A Analyst, Snowflake Data Engineer, AI/Data Engineer, and Junior Data Analyst for Campus Placements.
New to SQL? Start here
Write your first SQL query in the next 60 seconds.
SQL is the language data jobs run on. Analysts, engineers, product managers and BI developers use it every day. You don't need a degree, a setup or a credit card: every lesson runs live, right here in your browser.
- 1Learn one idea at a timeShort lessons, starting with SELECT, WHERE and ORDER BY.
- 2Run real queries instantlyEdit the code, hit Run, see real results. Mistakes are free.
- 3Prove it and keep goingA quiz after every lesson, then a career path when you're ready.
- No installs
- Beginner lessons free forever
- Learn at your own pace