Cohort LTV by First Purchase Month

SQL practice question · Hard · Analytics · Myntra

Only orders with status 'DELIVERED' count as revenue (ignore RETURNED and CANCELLED everywhere, including when deciding a customer's cohort). A customer's cohort is the calendar month of their first delivered order; month offset 0 is that month, 1 is the next calendar month, and so on. For each cohort return cohort_month ('YYYY-MM'), cohort_size (customers), and ltv_m0, ltv_m1, ltv_m2 = cumulative delivered revenue of the cohort up to and including month offset 0/1/2, divided by cohort_size, ROUND to 2. Order by cohort_month.

Table: orders

Schema of orders
ColumnType
order_idINTEGER
customer_idINTEGER
order_dateDATE
amountREAL
statusTEXT
Sample rows of orders
order_idcustomer_idorder_dateamountstatus
112026-01-051000DELIVERED
212026-02-10500DELIVERED
322026-01-20800DELIVERED
422026-03-02400DELIVERED
532026-02-031200DELIVERED
632026-02-25300RETURNED
732026-03-15600DELIVERED
842026-02-14700DELIVERED
Expected output on the sample data
cohort_monthcohort_sizeltv_m0ltv_m1ltv_m2
2026-01290011501350
2026-02295012501250

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