Day 58 · Wednesday, 30 September 2026
From the archive
Build a duplicate-free client list from an order log, and count who's on it
UNIQUE drops the repeats out of a column without needing it sorted first, and a spilled-range reference lets COUNTA count exactly as many rows as UNIQUE actually returned, rather than a fixed guess at how many that would be.
Task:
You handle order processing for Bramwell Wholesale Goods, a home-goods distributor. The order log below lists every sale this quarter, and a repeat client shows up once per order — several appear three or four times. Marketing wants a clean, duplicate-free client list for a seasonal mailing. In E2, use UNIQUE to list each client from B2:B9 once. In G2, count how many clients that list came to.
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