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SQL Playground · Lending KPIs

In-browser SQLite · Snowflake-shaped schema · 21 challenges · zero backend
Schema loaded github.com/wisemanmax
// portfolio · sql proof-of-craft

A real SQL workbench against a synthetic lending portfolio. Pick a prompt, write the query, ship the answer.

Five tables, ~1,700 loans, ~28k payments — generated in your browser with seeded patterns that mirror real portfolio behavior: FICO-driven loss curves, channel funnel drop-off, vintage delinquency drift, repeat-borrower cross-sell signal. Open the schema, pick a challenge, and verify the SQL runs against live data.

CATEGORY
All
Risk
Funnel
Portfolio
Behavior
Vintage
Pricing
DIFFICULTY
All
Easy
Medium
Hard

Schema click table to preview

Query — scratch query —

// approach

Table
Chart
Plan
— ready —
Press ▶ Run or hit ⌘ ↵ to execute the query.
Run a query, then click Plan to see SQLite's execution plan.
built with sql.js · codemirror · vanilla js · synthetic data deterministically seeded · ~1,700 loans, ~28k payments

// query history

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