dfr drop for dataframe> dfr drop {flags} ...rest
...rest: column names to be dropped| input | output | 
|---|---|
| any | any | 
drop column a
> [[ab]; [12] [34]] |dfr into-df|dfr dropa
╭───┬───╮
│# │ b │
├───┼───┤
│0│2│
│1│4│
╰───┴───╯
Tips: Dataframe commands were not shipped in the official binaries by default, you have to build it with --features=dataframe flag
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    https://www.nushell.sh/commands/docs/dfr_drop.html