Payment Success Funnel by Method

SQL practice question · Hard · Analytics · Stripe, PhonePe

Each payment logs events 'initiated', 'authorized', 'captured' or 'failed' (the same event can be logged more than once because of retries). A payment counts at a funnel stage only if it also reached every earlier stage: initiated -> authorized -> captured (a 'captured' log without an 'authorized' log does not count as captured). Payments that were never initiated are ignored. For each method return method, initiated, authorized, captured (distinct payments at each stage), auth_rate_pct = 100 * authorized / initiated and capture_rate_pct = 100 * captured / authorized, both ROUND to 1 (NULL when the denominator is 0). Order by method.

Table: payment_events

Schema of payment_events
ColumnType
payment_idINTEGER
methodTEXT
eventTEXT
event_timeTIMESTAMP
Sample rows of payment_events
payment_idmethodeventevent_time
1UPIinitiated2026-04-01 10:00:00
1UPIauthorized2026-04-01 10:00:04
1UPIcaptured2026-04-01 10:00:09
2UPIinitiated2026-04-01 10:05:00
2UPIauthorized2026-04-01 10:05:03
3UPIinitiated2026-04-01 10:07:00
3UPIfailed2026-04-01 10:07:20
4CARDinitiated2026-04-01 11:00:00
Expected output on the sample data
methodinitiatedauthorizedcapturedauth_rate_pctcapture_rate_pct
CARD21150100
NETBANKING210500
UPI32166.750

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