I will write, fix or speed up sql queries for bigquery, postgresql or mysql

SQL has been my main tool for 7 years. At Paytm I ran revenue, P&L and reconciliation work in BigQuery and Databricks. I also wrote Think in SQL, a book that teaches SQL from zero.

I can:

• Write queries that answer your business question
• Fix queries that error out or return the wrong numbers
• Speed up slow queries with better joins, CTEs, indexes and partitions
• Clean and reshape tables for reports and dashboards

You get the query, a short note on what it does, and the result table if you share data access or a sample.

Works with BigQuery, PostgreSQL, MySQL, Databricks SQL and Amazon Athena. For a big job, send me your schema or a sample before ordering.