Why is SQL the first skill to learn for data roles?
Most company data sits in databases, and SQL is how analysts get it out. Before you build a Power BI dashboard or a Python notebook, you usually write a query to pull and shape the data.
SQL also shows up in interviews for analyst, business analyst and many product and marketing analytics roles, often as a live or timed test. See our data analytics interview questions guide for the kind of reasoning interviewers look for.
What should an analyst-grade SQL course syllabus include?
Many beginner courses stop at SELECT, WHERE and simple JOINs. That is not enough for analyst work. Use this checklist to judge any SQL course, free or paid:
| Level | Topics | What you should be able to do |
|---|---|---|
| 1. Basics | SELECT, WHERE, ORDER BY, LIMIT, DISTINCT, NULL handling | Filter and sort a table to answer a simple question |
| 2. Aggregation | COUNT, SUM, AVG, GROUP BY, HAVING, CASE WHEN | Build a summary such as orders and revenue by city |
| 3. Joins | INNER, LEFT, self joins, joining on multiple keys | Combine orders, customers and products without duplicating rows |
| 4. Subqueries and CTEs | Subqueries, WITH clauses, chaining steps | Break a complex question into readable steps |
| 5. Window functions | ROW_NUMBER, RANK, LAG, LEAD, running totals, PARTITION BY | Find each customer's first order, or month-on-month growth |
| 6. Dates and strings | Date truncation, date differences, string cleaning | Build weekly or monthly trends from raw timestamps |
| 7. Business analysis | Funnels, cohorts, retention, deduplication | Answer "what share of July's new users came back in August?" |
| 8. Working practice | Query readability, checking results, basic performance | Write queries a teammate can read and trust |
Levels 1–3 are the basics. Levels 4–7 are where analyst interviews and real work usually live. A course that skips them leaves a gap you will need to fill yourself.
What are good free SQL courses and resources?
You can cover most of the syllabus above without paying. Some well-known free options:
- Kaggle Learn (Intro to SQL and Advanced SQL): short, free, hands-on lessons that use Google BigQuery, with exercises in notebooks.
- SQLBolt: short interactive lessons in the browser, good for levels 1–3.
- Mode SQL tutorial: a free written tutorial that goes from basics to more advanced analytical SQL.
- W3Schools SQL: a quick syntax reference with runnable examples.
- Free modules inside larger courses: some platforms offer free SQL modules, sometimes with a paid certificate. Our list of free data analytics courses with certificates covers these.
What is free and what needs a paid plan changes over time, so check each platform's current page.
Where can you practise SQL problems?
Watching lessons is not enough; you need to write a lot of queries. These platforms are popular with Indian job seekers:
| Platform | What it is good for | Note |
|---|---|---|
| HackerRank | Graded SQL problems by difficulty, plus skills certifications | Its SQL (Basic) certification is a 30-minute test with 2 questions |
| LeetCode | Interview-style database problems and a SQL study plan | Some problems need a paid plan; check the site |
| StrataScratch | Questions modelled on company interview problems | Mix of free and paid questions; check the site |
| DataLemur | SQL interview questions with explanations | Mix of free and paid content; check the site |
| Your own database | Practising on realistic, messy data | Install PostgreSQL or MySQL and load a public dataset |
A simple routine: two or three problems a day, rising in difficulty, and one weekly mini-project on a real dataset. Timed practice helps with online assessments.
Learn SQL as part of the full analyst toolkit
The ISS Data & Business Intelligence program covers SQL from basics to CTEs, window functions and cohort analysis, alongside Excel, Python and dashboards. Compare its SQL coverage with the checklist above.
View Data & Business Intelligence curriculum →Is a free SQL course enough, or should you pay?
A free course is usually enough if: you are disciplined, you only need SQL (not the full analyst toolkit), and you can find answers on your own when stuck.
Paying tends to help if: you want someone to review your queries, you need business-style case problems rather than puzzles, you keep stalling on CTEs and window functions, or you are learning SQL as part of a career switch into analytics.
For a career switch, SQL alone is rarely enough. Most analyst roles also ask for Excel, a BI tool such as Power BI or Tableau, and the ability to explain findings. In that case, a full data analyst course that teaches SQL alongside these skills can be better value than a standalone SQL course. Our data analyst course fees guide compares costs.
How do paid options that include SQL compare?
Here is how SQL is covered in a few paid options, based on official pages checked in September 2026:
| Option | Fee (as listed) | SQL coverage | Format |
|---|---|---|---|
| Google Data Analytics Certificate (Coursera) | ₹1,902/month | JOINs, subqueries, aggregates, temporary tables; CTEs and window functions not mentioned in the course materials | Self-paced |
| Great Learning Data Analytics and Power BI Bootcamp | USD 1,800 on the page we checked | SQL module within a 12-week Power BI-focused program | Weekly online mentorship and labs |
| Simplilearn AI-Powered Data Analytics (IITM Pravartak) | ₹1,19,999 incl. taxes | SQL data manipulation module within a 7-month program | Live online + self-paced |
| ISS Data & Business Intelligence | ₹69,999 (₹66,499 upfront) | Two weeks on SQL: PostgreSQL basics, then joins, CTEs, window functions and cohort/retention SQL | Live weekend sessions, 16 weeks |
For deeper reviews, see is the Google Data Analytics Certificate worth it, our Simplilearn review and our Great Learning review.
Which SQL should you learn: MySQL, PostgreSQL or SQL Server?
The core language is the same across databases. If you learn SELECT, JOIN, GROUP BY, CTEs and window functions in one, moving to another takes days, not months. Differences are mostly in date functions and a few keywords.
Pick one and stay with it while learning. PostgreSQL and MySQL are free and widely used. Cloud warehouses such as BigQuery and Snowflake use very similar SQL. Check job posts in your target city for any strong preference.
A realistic 8-week SQL learning plan
This is an ISS suggestion for someone studying about 6–8 hours a week. Adjust it to your pace.
| Weeks | Focus | Output |
|---|---|---|
| 1–2 | Basics and aggregation | 30+ easy problems solved |
| 3 | Joins | A query set combining 3+ tables |
| 4–5 | Subqueries, CTEs and date functions | A monthly trend report from raw order data |
| 6 | Window functions | First-order, ranking and growth queries |
| 7 | Cohorts and funnels | A simple retention table |
| 8 | Project and write-up | A portfolio project with a clear business finding |
Turn week 8 into a portfolio piece. Our guide to data analyst resume projects shows how to frame it.
Checklist before you enrol in any SQL course
- Does the syllabus cover CTEs, window functions and date handling?
- Will you practise on realistic business data, not just toy tables?
- Is there feedback on your queries, human or automated?
- Is there a project you can show in a portfolio?
- For paid courses: what is the full fee, including GST, and the refund policy?
Frequently Asked Questions
Which is the best SQL course in India for beginners?
There is no single best course. Free options such as Kaggle Learn, SQLBolt and the Mode SQL tutorial are good starting points. Choose one whose syllabus goes beyond basics to CTEs and window functions, and practise daily.
Can I learn SQL for free?
Yes. Free courses and practice platforms cover most of what an analyst needs. Paid courses mainly add structure, feedback and business case problems.
How long does it take to learn SQL for a data analyst job?
Many people reach a working level in about 6 to 8 weeks at 6 to 8 hours a week, based on our suggested plan. Advanced fluency takes longer and comes from regular practice on real data.
Should I learn MySQL or PostgreSQL?
Either is fine. The core SQL is the same, and switching later takes little time. Check job posts in your target city for any preference.
Is SQL enough to get a data analyst job?
Usually not on its own. Most analyst roles also ask for Excel, a BI tool such as Power BI or Tableau, and communication skills. SQL is the foundation, not the whole job.
Does the ISS Data and Business Intelligence program teach SQL?
Yes. The program page shows two weeks on SQL, covering PostgreSQL basics, joins, CTEs, window functions and cohort or retention analysis, within a 16-week live program.
Sources and methodology
Fees, formats and syllabus details were checked on official pages in September 2026.
- Coursera, Google Data Analytics Professional Certificate and Analyze Data to Answer Questions (SQL topics), checked September 2026.
- Great Learning, Data Analytics and Power BI Bootcamp, checked September 2026.
- Simplilearn, AI-Powered Data Analytics (IITM Pravartak), checked September 2026.
- HackerRank, SQL (Basic) skills certification (test length and questions), checked September 2026.
- Kaggle, Intro to SQL and Advanced SQL; SQLBolt; Mode SQL tutorial; W3Schools SQL; LeetCode; StrataScratch; DataLemur. Free and paid tiers change; check each site.
- ISS: program page (SQL weeks) and fees page.
The syllabus checklist and the 8-week plan are ISS editorial guidance, not provider figures.
Next steps
If you want to learn SQL together with Excel, Python and dashboards in a live 16-week cohort, review the Data & Business Intelligence curriculum.
Applying is free, and you pay only after accepting an offer. Apply here.