🚀 SQL Server CTE Mastery: From Beginner to Interview Ready If you've ever struggled with long SQL queries, nested subqueries, duplicate records, hierarchy problems, or SQL interview questions, then ...
"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 → ...
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 ...
This project demonstrates SQL-based analysis on an ecommerce dataset.
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