Free SQL resources for clearer queries and better data answers
Get practical SQL learning materials from Baldwin Apps, including checklists, companion guides, book updates, and tools for recognizing reusable SQL patterns.
Start with the free SQL Analyst Checklist: a simple review guide for checking grain, metrics, joins, filters, date ranges, and denominators before trusting a report.
SQL Analyst Checklist
A compact guide for reviewing analytical SQL before a number becomes a report.
- Define the metric and grain
- Check joins before trusting totals
- Confirm date ranges and filters
- Verify denominators for rates
- Add caveats before sharing results
What the checklist helps you catch
Many SQL mistakes are not syntax mistakes. They happen when a query answers a slightly different question than the one the business actually asked.
Wrong grain
Make sure one row means what the report needs it to mean: one row per customer, order, day, month, segment, or another clear unit.
Wrong denominator
Rates, percentages, conversion reports, and contribution reports only make sense when the numerator and denominator are both clear.
Join surprises
Catch fan-out, missing matches, and accidental row loss before a join quietly changes the number.
Built to support the Baldwin Apps SQL ecosystem
The resources here connect with Baldwin Apps SQL books and SQL Bubble Pop, so you can learn the idea, see the pattern, and practice recognizing it.
SQL Recipes for Data Analysts
Practical SQL recipes for turning real business questions into clear query patterns and report-ready answers.
View SQL books →SQL Patterns
A companion approach focused on recognizing reusable query shapes behind common SQL problems.
Explore the companion book →SQL Bubble Pop
An approachable SQL learning app that helps you practice query structure and build intuition through play.
Download the app →Free SQL Formatter
Format messy SQL, minify queries, copy SQL as a code string, and use lightweight pattern hints while working with queries.
Use the free SQL formatter →SQL Practice for Data Analysts
Practice analyst-focused SQL patterns, common query mistakes, and query-building logic with a playful SQL Query Shuffle mini-game.
Visit the data analyst room →Join the Baldwin Apps SQL mailing list
Sign up to receive the SQL Analyst Checklist and occasional updates about SQL books, companion materials, new guides, future learning tools, and Baldwin Apps product releases.
You’ll also receive occasional updates about SQL books, companion materials, new guides, and Baldwin Apps learning tools.
Recognize the pattern.
Answer the question.
Practice the skill.
Baldwin Apps SQL resources are designed to help technical learners move from isolated syntax to practical, reusable SQL understanding.