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L. MANSFIELD

02 / Skill · SQL

SQL.

I design reliable data models and write production-grade SQL that turns messy operations into trusted business metrics.

About

SQL is the core of my analytics engineering work: dimensional modeling, transformation logic, and data quality checks. I use it daily supporting point-of-sale systems at ZooTampa and in warehouse projects on Supabase Postgres and Microsoft Fabric. My focus is readable queries, maintainable warehouse structure, and stakeholder-ready datasets.

Impact Highlights

Projects

Featured · Real business data

RFM Customer Segmentation · ZooTampa

Built Recency-Frequency-Monetary segmentation over guest transaction data, turning raw purchases into business-relevant customer groupings surfaced in Power BI.

SQL Databricks Streaming

Simulated RFM Customer Segmentation

RFM-based customer segmentation built on simulated transaction data, identifying high-value and at-risk cohorts from transaction history.

SQL Supabase

Owl Park Medallion Pipelines

Designed SQL-centric transformation flow from operational Supabase tables into analytics-ready layers powering Power BI.

SQL Supabase Microsoft Fabric

Dynamic Pricing Simulator Monitoring

Built the aggregate and historical context layer supporting agent pricing and inventory decisions.

SQL n8n Supabase

Tools

PostgreSQL Supabase Microsoft Fabric SQL Databricks SQL Supabase SQL MSSQL for Dynamics CRM DuckDB

Process

  1. Identify business requirements and define target metrics (OKR, KPIs, supporting metrics).
  2. Model entities and relationships for stable downstream use.
  3. Build transformations in audited, testable SQL steps.
  4. Validate outputs against source totals and edge cases.
  5. Document assumptions so BI and ML layers stay aligned.

Proof

Secondary-skill links

Looking for an Analytics Engineer role where data modeling and KPI trust are core deliverables.

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