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English
$
USD
I will write complex sql queries and design optimized relational databases
Turning numbers into useful information
I'm an experienced data analyst skilled in Excel, Power BI, SQL (MySQL, PostgreSQL, MS SQL Server, Snowflake), Python (Pandas, NumPy, Matplotlib, Seaborn), and Alteryx. I specialize in data cleaning, ...
Level 1
Has met certain performance criteria and shows strong potential in the marketplace.
About this Gig
High-Performance SQL Solutions & Optimized Database Engineering
Sub-optimal database architecture and poorly structured queries drain system resources, increase latency, and stall business applications. I engineer production-ready relational database schemas and write optimized SQL scripts tailored to your exact operational parameters.
Operational Deliverables:
- Advanced Query Engineering: High-performance data extraction, multi-table JOIN frameworks, complex subqueries, CTEs, and window functions.
- Performance Tuning & Optimization: Execution plan analysis, query bottleneck detection, and deliberate indexing strategies to reduce execution runtimes.
- Database Architecture & Design: Clean Entity-Relationship Diagrams (ERD), schema generation, and structural normalization (1NF, 2NF, 3NF).
- Cross-Platform Deployment: Enterprise-grade script execution across MySQL, PostgreSQL, MS SQL Server, and Snowflake.
Project Standards:
Every asset delivered features meticulous inline documentation, standardized formatting arrays, and comprehensive data integrity verification.
CRITICAL: Please send your relational schema specifications or sample dataset profiles
Platform:
MySQL
•
PostgreSQL
•
SQLite
•
SQL Server
Expertise:
SQL
•
ER diagrams
•
Normalization
•
Query optimization
FAQ
1. What do I need to provide to get started?
I need details about your database structure (table names, columns, relationships) and the specific queries or tasks you need help with. If possible, sharing sample data or database schema would be helpful.
2. Which databases do you work with?
I work with MySQL, PostgreSQL, Microsoft SQL Server, and Snowflake. If you need help with another SQL-based database, feel free to ask!
3. Can you optimize my existing SQL queries?
Yes! I can review your queries for performance issues and optimize them using indexing, query restructuring, and execution plan analysis.
4. Do you offer database design services?
Yes! My Premium package includes ER diagram creation, normalization, and full database schema design for optimized performance.
Reviews
3 reviews for this Gig
| (2) | ||
| (1) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
A alper4599
Repeat Client
Netherlands
He demonstrates strong expertise and performs his work at an exceptional level.
Up to $50
Price
1 day
Duration
Helpful?A alper4599
Repeat Client
Netherlands
He really knows what he’s doing., great job.
Up to $50
Price
1 day
Duration
Helpful?B 
banister
United States
Very skilled in the topics I had requested him to go through, and has a deep level of knowledge in different topics. I highly recommend anyone that is looking to learn about SQL, Tableau, PowerBI, Alteryx, and more reach out to him! He simplifies things and is a great teacher!
$50-$100
Price
2 days
Duration
I 
Seller's Response
Helpful?
Reviews
3 reviews for this Gig
| (2) | ||
| (1) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
A alper4599
Repeat Client
Netherlands
He demonstrates strong expertise and performs his work at an exceptional level.
Up to $50
Price
1 day
Duration
Helpful?A alper4599
Repeat Client
Netherlands
He really knows what he’s doing., great job.
Up to $50
Price
1 day
Duration
Helpful?B banister
United States
Very skilled in the topics I had requested him to go through, and has a deep level of knowledge in different topics. I highly recommend anyone that is looking to learn about SQL, Tableau, PowerBI, Alteryx, and more reach out to him! He simplifies things and is a great teacher!
$50-$100
Price
2 days
Duration
I Seller's Response
Helpful?
