"Should I use a CTE or a subquery?" I asked this question every day when I started writing SQL. Here's the framework I use now. Use a CTE when: → Your logic has multiple steps (staging → filtering → ...

Subqueries in SELECT statements suck man. When developers first find out you can do this, a subquery in your SELECT clause looks like a clever trick. It keeps me in a job as a performance tuner. When ...

This profile has not been claimed by the company. See reviews below to learn more or submit your own review. Select Portfolio Servicing (SPS) delivers specialized mortgage servicing solutions. The ...

AVG(CASE WHEN m.season='2013/2014' AND m.home_goal = m.away_goal THEN 1 WHEN m.season='2013/2014' AND m.home_goal != m.away_goal THEN 0 END) AS ties_2013_2014, AVG(CASE WHEN m.season='2014/2015' AND m ...

Tricare Select is a fee-for-service insurance plan that lets you see any doctor. This plan is available to family members, veterans, and retirees. Tricare Select is a fee-for-service insurance plan ...

This project demonstrates SQL-based analysis on an ecommerce dataset.