Ask a SQL question
Bring a small input, your query, and the result you expected. Each forum post keeps the question and its discussion together.
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Data Checks by SyneHQ
Bring a question.
Show your work.
A Discord community for people who want to understand their data and explain how they reached an answer. Practical SQL, data engineering, and analytics. Any stack is welcome.
A new community, hosted by SyneHQ. No product subscription required.
Find your starting point
Useful conversations need a little structure.
Show your work
Share an analysis, a useful check, or a mistake you learned from. Explain the method and where the result stops being reliable.
#show-your-work
Keep learning
Start with runnable SQL exercises and official documentation. Discuss DuckDB, ClickHouse, Postgres, or the tools you already use.
#resources
A good first contribution
Run a check. Explain what changed.
01 / Join fanout
When $200 becomes $560
Find the repeated rows and fix the grain before summing.
Read the walkthrough 02 / CSV auditA file can load and still be wrong
Keep invalid values visible before calculating the metric.
Read the walkthrough 03 / Cohort retentionCount people, not repeated events
Define the denominator and keep unfinished months separate.
Read the walkthroughFree, fictional datasets with SQL and expected results. Run locally in DuckDB; no community membership needed.
Make it easy to help
A small example beats a vague screenshot.
You do not need a polished project. A clear question, a few fictional rows, and the result you expected are enough to start a useful discussion.
Engine / version:
What I want to understand:
Small fictional input:
Query:
Expected output:
Actual output or error:
What I have tried:Good data work. Decent people.
- Challenge an assumption without attacking its author.
- Use fictional or safely anonymized data. Keep credentials and private customer records out of chat.
- Make claims checkable, credit sources, and disclose your affiliation when sharing a tool.
- Keep promotion relevant. No repetitive pitches or unsolicited sales messages.
Join Data Checks on Discord
Read the rules, introduce yourself, and bring one question. Beginners and experienced practitioners are both welcome.