---
title: "Bloker dubletter | ExcelOpgaver"
description: "Øv en regel i Excels datavalidering der blokerer dubletter, med TÆL.HVIS, og få formlen rettet med det samme."
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> Index of every page on this site: [llms.txt](https://excelopgaver.dk/llms.txt)

# **Bloker dubletter**

**Premium**

Hvert kundenummer må kun bruges én gang. Reglen gælder A2:A6 og er skrevet til A2. Tæl i C2 hvor mange gange A2 står i A2:A6 med TÆL.HVIS, og test at tallet er præcis 1. Lås listen med $.

C2fx

|  | A | B | C | D | E | F |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | Kundenr. | Navn | Regel |  |  | |
| 2 | 1005 | Anne Holm |  |  |  | |
| 3 | 1002 | Jonas Berg |  |  |  | |
| 4 | 1001 | Mette Lund |  |  |  | |
| 5 | 1003 | Ali Khan |  |  |  | |
| 6 | 1004 | Sara Juhl |  |  |  | |
| 7 |  |  |  |  |  | |
| 8 |  |  |  |  |  | |

**Premiumopgave**

## **Lås op for Rullelister og datavalidering og alle andre opgaver**

Det er en premiumopgave. Med premium kan du løse den og alle andre opgaver, tage prøvetest på tid og få certifikater, du kan dele på LinkedIn.

Næste med premium:**TÆL.HVIS****SUM.HVIS**

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```

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