Portfolio sample: 5 reporting queries (CTEs, window functions, joins) over a synthetic sales database (60 customers, 600 orders).
schema.sql,seed.sql: build the database (or use the includeddemo.db)reports.sql: monthly revenue + MoM growth, top 10 customers by LTV, regional revenue share, refund rate, churn-risk listsample-output.txt: actual results Run:sqlite3 -header -column demo.db < reports.sql