I will write and fix sql queries for reports in mysql, postgresql or bigquery

Need numbers you can trust? I write and fix SQL for reporting and analysis, and I test every query before you get it.

What I can do

• Turn a plain-English question into a query ("monthly revenue by channel with growth vs last month")
• Fix queries that return duplicates, wrong totals or nothing at all (join fan-out is the usual cause)
• CTEs and window functions: running totals, rankings, top N per group, cohorts, retention, funnels
• Speed up slow queries with rewrites, index suggestions and EXPLAIN review
• Convert queries between MySQL, PostgreSQL, SQL Server, SQLite, BigQuery and Snowflake

Every query comes with comments that explain the logic, plus sample output from your data or a test copy.

Not included: database design or ERDs, stored-procedure apps, or graded homework and exams.

How I work: I use AI-assisted tools for drafting and documentation. I run, verify and stand behind every query myself.

I never need write access to your production database. A schema and a small sample, or a read-only user, is enough.

Send me your schema and question before ordering if you're unsure which package fits.