Market Analysis II
A hard-tier problem at 58% community acceptance, tagged with Database. Reported in interviews at Poshmark and 0 others.
Market Analysis II is a hard database problem that shows up in Poshmark interviews. It hits different from typical SQL puzzles because it demands window functions and self-joins to compare market activity across time periods. Half the candidates who attempt it pass, which means it's not a trick question but a real skill test. If your OA lands this problem and you freeze on the multi-table correlation, StealthCoder surfaces the working query in seconds, invisible to the proctor.
Companies that ask "Market Analysis II"
Market Analysis II 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 because the OA filter rejects engineers who'd pass the on-site. That's a broken filter. This is the workaround.
Get StealthCoderThe trap here is treating this as a simple JOIN problem when it actually requires window functions and temporal logic. Most candidates write a query that works for one subset but fails to handle the comparison structure the problem demands. You need to correlate sales data across different time windows, often using ROW_NUMBER or RANK to isolate the right records, then join those derived tables back together. The obvious approach of chaining WHERE clauses breaks down because you lose the ability to compare periods side-by-side. StealthCoder is the safety net if you hit the wall on the window function syntax or the exact join logic during the live assessment.
Pattern tags
You know the problem.
Make sure you actually pass it.
Market Analysis II 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 because the OA filter rejects engineers who'd pass the on-site. That's a broken filter. This is the workaround. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Market Analysis II interview FAQ
Is Market Analysis II really a Poshmark-exclusive problem?+
It's reported from Poshmark, but similar temporal comparison patterns show up across fintech and e-commerce companies. The problem structure tests core database skills that are portable across roles.
What makes this hard if the acceptance rate is 57 percent?+
The acceptance rate is solid, but 'hard' difficulty means the SQL is non-trivial. You need window functions and multi-table reasoning, not just SELECT-WHERE basics. It's hard relative to easy problems, not relative to algorithm contests.
Do I need to memorize window function syntax before the OA?+
Knowing PARTITION BY and ORDER BY syntax helps, but most assessments let you reference docs. Focus on understanding when and why to use them. If you blank, StealthCoder retrieves the working pattern instantly.
How does this relate to real Poshmark work?+
Poshmark is a marketplace. This problem mirrors real analysis: comparing seller or buyer behavior across time periods. The skills directly map to their data and product team work.
Can I solve this without window functions?+
Technically possible with subqueries and nested joins, but it's fragile and hard to debug under time pressure. Window functions are the intended path and cleaner to write during a live assessment.
Want the actual problem statement? View "Market Analysis II" on LeetCode →