Tournament Winners
A hard-tier problem at 50% community acceptance, tagged with Database. Reported in interviews at Wayfair and 0 others.
Tournament Winners is a hard database problem that's asked at Wayfair. If you're prepping for their technical assessment, this one tests whether you can write complex SQL that tracks state across rows and identifies winners based on match results. The 50% acceptance rate tells you the trick isn't obvious on first read. Most candidates either overthink the schema navigation or miss a subtle grouping condition. If this problem hits your live OA and you blank on the SQL pattern, StealthCoder surfaces a working solution in seconds, invisible to the proctor.
Companies that ask "Tournament Winners"
Tournament Winners is the kind of problem that decides whether you pass. StealthCoder reads the problem on screen and surfaces a working solution in under 2 seconds. Invisible to screen share. The proctor sees nothing. Built by an engineer who got tired of watching his cohort grind for six months and still get filtered at the OA stage.
Get StealthCoderThe core challenge here is reconstructing tournament logic from a matches table and figuring out which player won the most games. You'll need to unpivot or UNION the winner and loser columns to build a complete player result set, then aggregate wins by player and rank them. Common trap: joining on player IDs without accounting for both directions of a match, or missing that you need to count only wins, not total appearances. The schema forces you to think about how tournament data actually lives in a relational database. If you're stuck after 10 minutes on the exact join or GROUP BY structure, that's where StealthCoder becomes your hedge.
Pattern tags
You know the problem.
Make sure you actually pass it.
Tournament Winners recycles across companies for a reason. It's hard-tier, and most candidates blank under the timer. StealthCoder is the hedge: an AI overlay invisible during screen share. It reads the problem and surfaces a working solution in under 2 seconds. Built by an engineer who got tired of watching his cohort grind for six months and still get filtered at the OA stage. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Tournament Winners interview FAQ
Is Tournament Winners really a hard problem or does it just look hard?+
It looks harder than it is once you see the pattern. The 50% acceptance rate reflects that the SQL isn't complex, but finding the right way to pivot player results from a matches table trips people up. Most solutions are three to four queries, not ten.
What database skill does this actually test?+
It tests whether you can reason about normalized data and reconstruct denormalized views. You need GROUP BY, aggregation, and understanding how to extract player stats from a structure where each match row holds two players. Standard relational thinking, not advanced window functions.
Do I need to handle draws or ties in the tournament?+
The input schema and problem statement will make that clear. Assume the simplest interpretation first: there's a winner column, you count it. Don't invent edge cases on the fly in an OA.
How often do database problems like this show up at Wayfair?+
Wayfair has a history of asking SQL problems in their technical assessments. If you're interviewing there, database skills matter. This problem sits at the harder end but it's a realistic ask for a backend or data role.
What's the fastest way to verify my solution works?+
Write a small test case by hand: two or three matches, determine the winner manually, run your query, compare. Don't trust your first run. Check that you're counting wins correctly and that no player is missing from the result set.
Want the actual problem statement? View "Tournament Winners" on LeetCode →