This must be very simple but I could not find an appropriate answer. I have imported a huge .xlsx file with three columns: country name, date and a value and I would like to DateListPlot the values against the dates only for some countries. This is the code used:

```
DateListPlot[data[1 ;; 720, {"date", "value"}], PlotRange -> All, FrameLabel -> {{None, None}, {None, HoldForm[Austria]}}]

```

Instead of adding manually the row numbers (1;;720), I'd like to tell Mathematica to plot the date-values for rows having "Austria" on column 1.

Thanks!