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Pattern

Period-over-period

8 problemsin this pattern, climbing easy → medium → hard. Pick wherever you're calibrated.

EZ

Easy

0 / 2 solved

Month-over-month revenue change
SQL · ~5 min
NEW
Year-over-year same-month revenue
SQL · ~5 min
NEW

MD

Medium

0 / 3 solved

Month-over-month growth per category
SQL · ~8 min
NEW
Quarter-over-quarter from monthly data
SQL · ~10 min
NEW
Index every month to January 2025 = 100
SQL · ~6 min
NEW

HD

Hard

0 / 3 solved

Stacked t-1, t-3, t-12 via date arithmetic
SQL · ~12 min
NEW
Trailing 6 months vs prior 6 months
SQL · ~15 min
NEW
Year-over-year revenue growth per month
SQL · ~14 min
NEW