hello everyone, I want to create a chart that breaks down by credit card and the metric is the number of customers with transactions. The problem is that I have the following table:
| Credit Card | id_num | transaction_date |
| Credit Card1 | 10 | 01-01-2023 |
| Credit Card1 | 10 | 01-01-2023 |
| Credit Card2 | 13 | null |
| Credit Card3 | 12 | 01-02-2023 |
as you can see in the table, the customers are repeated. How can I create a parameter or make it count only the customers with transactions and avoid repetitions?
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