Abdullah Qamar
Excel data cleaning and formatting specialist | data analyst
New to Contra
Abdullah is ready for their next project!
Completed: BCG Introduction to Data for Decision Makers Job Simulation
A hands-on simulation focused on using data to solve a client’s marketing problem.
What I worked on:
Analyzed campaign performance across channels and customer segments
Evaluated conversion and sales trends
...
Clean Data. Better Decisions. 📊
Messy, inconsistent, or duplicate-filled spreadsheets can make analysis difficult and time-consuming.
I help businesses and individuals turn raw Excel data into clean, structured, accurate, and analysis-ready datasets.
What I can help with:
• Remove...
📊 Large-Scale Transaction & Sales Data Cleaning
I recently completed a data cleaning project involving 533,643 transaction & sales records.
The dataset required standardization and quality checks across multiple fields.
Work performed:
• Transaction number cleaning and...
Continuing to build my SQL foundation — here's what I explored today 📊
Here's what I covered:
✅ HAVING – Filtering grouped data (works after GROUP BY, unlike WHERE)
✅ UPDATE – Modifying existing records in a table
✅ DELETE – Removing records based on specific conditions
✅ IN –...
Been diving deep into SQL these past few days and wanted to share what I've learned so far 📊
Here's what I covered:
✅ WHERE – Filtering data based on specific conditions
✅ Operators – Comparison & logical operators (=, >, <, AND, OR, etc.)
✅ BETWEEN – Filtering values within a...
