Independent practice · Spreadsheet

Deduplicate customer contacts

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Edit the grid or the CSV. Formulas use grid row numbers, including the header row.

Business key

Supported formulas

SUM, SUMIF, COUNTIF, IF, TRIM and exact LOOKUP. Arithmetic, single-column ranges and cell references are supported. Example: =SUM(B2:B3). Cycles are rejected. Empty numeric values stay empty unless you supply a declared default.

CSV answer

Import answer

Show the reference answer

customer_id,email
7,a@example.test
8,a@example.test

Email is not the declared key. Keep customer 8.