SQL pattern

Cohorts & Retention

3 problemsin this pattern, climbing easy → medium → hard. Pick wherever you're calibrated. Read the P23 tutorial →

Easy

0 / 1 solved

How many users signed up each month
SQL · ~4 min
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Medium

0 / 1 solved

Users who came back the month after signing up
SQL · ~9 min
NEW

Hard

0 / 1 solved

Cohort retention table for months 0–2
SQL · ~16 min
NEW