I will write and optimize sql queries and mongodb aggregations

Need a query for a report, export or application, or want to improve an existing slow query?

I'm Raphael from Smart Experiences in Germany. I write and review SQL queries and MongoDB aggregations with a focus on correct results, readable code and practical performance improvements.

Depending on the agreed scope, I can help with:

- Joins, filters, grouped reports and aggregations

- MongoDB aggregation pipelines

- Query rewrites and execution-plan analysis

- Index recommendations

- Views, stored procedures and reusable queries

You receive the agreed queries with an explanation of the changes and assumptions. Performance depends on your data, schema and environment; any improvement must be checked against representative data.

Please send your database engine/version, schema, current query and expected result before ordering. Use anonymized sample data where possible. We confirm query count and complexity first. Full database audits, migrations, infrastructure changes and ongoing support are separate scopes.

For a broken query or database error, please use my troubleshooting service. Communication is available in German and English.