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I will write and optimize database queries in mongodb, mysql, and sql server
Germany
I speak German, English
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About this Gig
Do you need fast and reliable SQL queries or want your database to run more efficiently?
I will create, debug, and optimize queries for MySQL, SQL Server, and MongoDB tailored to your needs.
What I offer:
- Query creation (joins, filters, aggregations, subqueries, window functions)
- Debug & fix broken queries (syntax errors, wrong results, timeouts)
- Query optimization (EXPLAIN, indexes, rewrites for faster performance)
- MongoDB aggregation pipelines (match, group, lookup, facet, performance tuning)
- Stored procedures, functions, views, and triggers (MySQL & SQL Server)
- Query analysis & reporting (KPIs, dashboards, CSV/Excel export)
Why choose me?
- Clear communication & professional delivery
- Well-documented code with comments
- Flexible packages: from simple queries to full database support
- Optional extras: fast delivery, detailed documentation, or video explanation
Whether you need 1 simple query or a full performance audit, I can help you get accurate results faster and easier.
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Database type:
Non-relational database
•
Relational database
Platform:
MongoDB
•
MySQL
•
SQLite
•
SQL Server
Expertise:
SQL
•
NoSQL
My Portfolio
FAQ
Can you work with production data?
Yes, but preferably with read-only access or anonymized data exports (JSON/CSV/SQL dump). I always follow data privacy best practices.
Do you optimize existing queries?
Absolutely. I analyze query plans (EXPLAIN/ANALYZE), suggest indexes, and rewrite queries for better performance.
Can you create stored procedures, functions, and views?
Yes, I can create and optimize stored procedures, views, and user-defined functions in MySQL and SQL Server.
Do you also work with MongoDB?
Yes. I build and optimize MongoDB aggregation pipelines (match, group, lookup, facet, etc.) for efficient results.
What do you need from me to start?
Please provide your database type/version, schema or sample data, and a clear description of your requirements.
Do you sign NDAs?
Yes, I am open to signing a non-disclosure agreement if required.
