hardDBS Bank · aggregationBasic
Flag duplicate DBS Bank transactions by customer and date together
Column A holds customer IDs, column B transaction dates. A duplicate transaction means the *same* customer ID *and* the *same* date both occur on another row — matching just one of the two isn't enough. Write formulas in C1:C5, one per row, that return TRUE for rows that are part of such a duplicate pair.
Starting grid
A1
| A | B | C | |
|---|---|---|---|
| 1 | C001 | 2026-01-05 | |
| 2 | C002 | 2026-01-06 | |
| 3 | C001 | 2026-01-05 | |
| 4 | C003 | 2026-01-07 | |
| 5 | C002 | 2026-01-08 |
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