dfr n-unique for dataframe

Signature

> dfr n-unique {flags}

Input/output types:

Examples

Counts unique values

> [1122334] |dfr into-df|dfr n-unique
╭───┬──────────────╮
│# │ count_unique │
├───┼──────────────┤
│0│4│
╰───┴──────────────╯

Creates a is n-unique expression from a column

>dfr cola|dfr n-unique

Tips: Dataframe commands were not shipped in the official binaries by default, you have to build it with --features=dataframe flag