Counter variable which adds n+1 to new data

[pepe2209]

Hello

I would like to create a variable which adds a number (+1) to each new data that's added after reloading the script. I am working with a external database which is updated automatically.

So data included in the first load looks like this:

Data	Counter
ABC	1
ABC	1
ABC	1

And then IF new data is added after reloading the script it automatically should look like this:

Data	Counter
ABC	1
ABC	1
ABC	1
ABC	2
ABC	2

It is not a problem if a number is skipped when the reload does not provide new data.

I hope someone can help me.

Thanks