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I will write, fix or optimize sql queries
Data Analyst, Industrial Engineer, Turning Data Into Decisions
Industrial Engineer focused on data analysis, dashboards and process optimization. I use SQL, Python and R to clean, model and visualize data. Experienced in forecasting, business analytics and supply...
À propos de ce service
Do you need fast, clean, and reliable SQL queries? I help businesses, analysts, and developers fix, write, and optimize SQL for accurate results and high-performance analytics. Whether your query is slow, returning incorrect data, or needs to be rewritten for dashboards or KPIs, I deliver clear and optimized solutions.
I work with BigQuery, MySQL, and PostgreSQL, creating efficient SQL for reporting, transformations, CTEs, joins, window functions, and BI workflows. From debugging errors to improving query performance and reducing cost (especially in BigQuery), I make your data ready for analysis.
What I offer:
- Fix broken or incorrect SQL queries
- Write SQL for analytics, KPIs, and dashboards
- Optimize queries for speed and cost
- Clean and transform datasets
- Analyze query logic and improve accuracy
You will receive well-structured SQL, fast delivery, and clear communication.
Send your schema or sample data, and I will take care of the rest.
Plateforme:
BigQuery
•
mySQL
•
PostgreSQL
Expertise:
SQL
•
DQL
•
Normalisation
•
Optimisation des demandes
FAQ
What do you need to start working on my SQL query?
I need your table schema, sample data (if available), and a clear description of what the SQL query should return. This helps me write, fix, or optimize your SQL efficiently.
Which databases do you support?
I work with BigQuery, MySQL, and PostgreSQL, providing SQL query writing, debugging, optimization, and analytics-focused transformations.
Can you optimize slow or expensive SQL queries?
Yes. I optimize SQL queries for speed, performance, and cost reduction—especially in BigQuery, where scanning costs can be improved significantly.
Do you write SQL for dashboards and analytics?
Absolutely. I create SQL queries for KPIs, reports, CTEs, window functions, and dashboard datasets used in Looker Studio, Power BI, and other BI tools.
Can you fix SQL errors or incorrect results?
Yes. I debug SQL errors, broken joins, incorrect aggregations, and logic issues to ensure your query returns accurate and reliable results.
