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What people report studying for — not a take-home dump. Last editorial update 2026-07-18.
Late ticksPoint-in-timeIdempotent loads
Rounds you should expect
SQL + streaming
A tick arrives late. How a point-in-time join to a security master stays correct.
From the question bank
hard · SQL · SQL
PERCENTILE_CONT vs PERCENTILE_DISC. When does a hiring manager care?
Practice →easy · SQL · SQL
CROSS JOIN a 10-row parameter table to a 10M-row fact. When is that correct?
Practice →