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You will get a review of your SQL queries or fresh ones written for you

Dennis M.Status: Offline
Dennis M. Dennis M.
5.0
Rising Talent
Preview image

Let a pro handle the details

Buy Database Queries services from Dennis, priced and ready to go.
Dennis M.Status: Offline
Dennis M. Dennis M.
5.0
Rising Talent
Preview image

Let a pro handle the details

Buy Database Queries services from Dennis, priced and ready to go.

Project details

Do you need help with writing or fixing SQL queries? I will write clean, efficient SQL to extract, filter, or analyze your data fast and accurately.

I'm Dennis a data analyst with experience using SQL to manage, query, and report data from databases like MySQL, PostgreSQL, and SQLite.

What I can do for you:
1. Write custom SELECT queries
2. Join multiple tables (INNER, LEFT, etc.)
3. Create views or subqueries
4. Aggregate, filter, and sort data for reports
5. Optimize slow queries
6. Clean or restructure your database tables

Databases supported: MySQL, PostgreSQL, SQLite, Google BigQuery
(I can also work with SQL-based exports from Excel, Python, or BI tools.)

Whether youre preparing data for a report or struggling with a JOIN, I will get your query written, explained, and working.
Database Type
MySQL, MS SQL, MS Access, Oracle, SQLite, PostgreSQL
What's included
Service Tiers Starter
$10
Standard
$25
Advanced
$50
Delivery Time 1 day 1 day 3 days
Number of Revisions
24Unlimited
Number of Queries
35
Query Debugging
Query Optimization
-
Query Scheduling
-
-
Query Analysis
-
-
Source Code
-
-
Optional add-ons You can add these on the next page.
Fast Delivery
+$20
Additional Revision
+$5
Query Optimization (+ 1 Day)
+$10
Query Analysis (+ 1 Day)
+$10
5.0
1 review
100% Complete
(1)
1% Complete
(0)
1% Complete
(0)
1% Complete
(0)
1% Complete
(0)

RC

Rowena C.
5.00
Apr 22, 2026
English - Search & Link Relevance - Data Annotation (IDI021) - Canada-based
Dennis M.Status: Offline

About Dennis

Dennis M.Status: Offline
Data Scientist/Analyst | Machine Learning | Python | R | SQL
5.0  (1 review)
Kingston, Canada - 1:04 pm local time
I will help you turn complex data into predictive insights and data-driven decisions. With 5+ years of experience in analytics, machine learning, and AI model development, I build models and data systems that improve forecasting, segmentation, and operational performance.

What I can help you with:

• Machine Learning – predictive modeling, classification, clustering, and recommendation systems
• Statistical Analysis – hypothesis testing, A/B testing, regression modeling, and experiment design
• Customer Analytics – churn prediction, segmentation, and behavioral modeling
• Data Science Workflows – data cleaning, exploratory data analysis, feature engineering, model training, and evaluation
• AI & LLM Work – model evaluation, dataset preparation, and annotation for training pipelines
• Data Visualization – communicating model insights through dashboards and reports

Tools & Technologies:

Python (Pandas, NumPy, scikit-learn)
R
SQL
TensorFlow • PyTorch
BigQuery • Snowflake • Databricks
Power BI • Tableau • Looker • Sigma • Mode Analytics

Impact:

• Cut dataset review cycles using Python validation pipelines
• Built dashboards and analytics systems used for operational and strategic decision-making

I hold a Master’s in Data Science (University of East London) and certifications from Google and the University of Michigan.

Steps for completing your project

After purchasing the project, send requirements so Dennis can start the project.

Delivery time starts when Dennis receives requirements from you.

Dennis works on your project following the steps below.

Revisions may occur after the delivery date.

Understand Your Requirements

Assess & Prepare the Data

Review the work, release payment, and leave feedback to Dennis.