Boss battlesqlHARD
SQL Fraud Detection Boss
Finance sees unusual retry behavior. Your query pack must be deterministic enough to send to auditors.
XP
820
Coins
160
Minutes
70
Required clears
10
not started
Boss Run Control
Start a boss stage, save stage clears, and build a persistent boss history tied to your profile.
Current stage: Detect duplicate charges0%
Recent boss events
No stage attempts saved yet.
Battle stages
1
Detect duplicate charges
Group suspicious transactions by user/order and sort ties deterministically.
GROUP BYHAVINGORDER BY
35% duplicate precision
Open linked mission2
Rank risk accounts
Use window functions to rank risky users while preserving stable tie breakers.
window functionpartitiontie-breaker
30% ranking correctness
Open linked mission3
Explain query plan
Recommend the smallest useful index and explain why low-cardinality columns are not enough.
selectivitycomposite-indexread-only
35% performance reasoning
Open linked missionGate design
Boss access is designed to require 10 clears across sql. The current local build shows the gate and linked stages; full timed boss persistence is stored through the BossBattle schema.