I will sql queries for mysql and postgresql
SQL Developer : Query Writing, Optimization and Database Design
Over deze dienst
Struggling with slow queries, messy data, or complex
reports? I help businesses solve database problems fast.
WHAT YOU GET:
Complex SQL queries (JOINs, CTEs, Window Functions)
Query optimization & indexing for slow performance
Database schema design & review
Data analysis & reporting-ready query sets
Clean, commented code with full explanation
DATABASES I WORK WITH:
MySQL | PostgreSQL
COMMON USE CASES:
Sales and revenue reports
Customer analysis (CLV, retention, churn)
Inventory and product performance
Employee and HR data queries
Dashboard data preparation
HOW IT WORKS:
1. Share your table structure or schema
2. Tell me what data or report you need
3. I write, test and deliver working queries
4. You get SQL file + explanation of every query
WHY CHOOSE ME:
I've built a temporal database tracking historical
data states and analyzed 100,000+ e-commerce orders
in SQL. Real project experience not just theory.
Portfolio:
SQL Query optimization: https://github.com/devdeepsarkar/sql-query-optimization
Ecommerce SQL Analysis: https://github.com/devdeepsarkar/ecommerce-sql-analysis
Not sure if I can help? Message me first.
I'll tell you honestly.
Databasetype:
Relationele database
Platform:
MySQL
•
PostgreSQL
Expertise:
SQL
•
DDL
•
DML
•
Query-optimalisatie
Veelgestelde vragen
What do you need from me to get started?
Just share your table structure (CREATE TABLE script or a screenshot) and describe what data or report you need. I'll handle the rest.
Which databases do you support?
MySQL and PostgreSQL
Will I understand the queries you write?
Yes — every query comes with clear comments explaining what each part does.
What if the queries don't work on my database?
I offer free revisions. Share the error and I'll fix it immediately.
Can you work with my existing database without changing the structure?
Absolutely. I only write queries that work with your current schema unless you ask me to suggest changes.

