Use Summarize()

```
Names Default To Here(1);
dt = Open("$SAMPLE_DATA/Big Class.jmp");
dt << Add Rows(1, after(N Row(dt)));
dt[N Rows(dt), 1] = dt[1, 1];
Summarize(dt, uniq = By(Column(dt, 1)));
show(uniq);
```

or associative array()

`Associative Array(Column(dt, 1)) << get keys`

or create summary table and get values from there

```
dt_summary = dt << Summary(
Group(Column(dt, 1)),
Freq("None"),
Weight("None"),
Link to original data table(0),
private
);
a = dt_summary[0, 1];
Close(dt_summary, No save);
show(a);
```

All of these have their own use cases

-Jarmo