select for filters

Select only these columns or rows from the input. Opposite of `reject`.

Signature

> select {flags} ...rest

Flags

• --ignore-errors, -i: ignore missing data (make all cell path members optional)

Parameters

• ...rest: the columns to select from the table

Input/output types:

input	output
list<any>	any
record	record
table	table

Examples

Select a column in a table

> [{a: a b: b}] | select a
╭───┬───╮
│ # │ a │
├───┼───┤
│ 0 │ a │
╰───┴───╯

Select a field in a record

> {a: a b: b} | select a
╭───┬───╮
│ a │ a │
╰───┴───╯

Select just the name column

> ls | select name

Select the first four rows (this is the same as first 4)

> ls | select 0 1 2 3

Select columns by a provided list of columns

> let cols = [name type];[[name type size]; [Cargo.toml toml 1kb] [Cargo.lock toml 2kb]] | select $cols

Select columns by a provided list of columns

> [[name type size]; [Cargo.toml toml 1kb] [Cargo.lock toml 2kb]] | select ["name", "type"]
╭───┬────────────┬──────╮
│ # │    name    │ type │
├───┼────────────┼──────┤
│ 0 │ Cargo.toml │ toml │
│ 1 │ Cargo.lock │ toml │
╰───┴────────────┴──────╯

Select rows by a provided list of rows

> let rows = [0 2];[[name type size]; [Cargo.toml toml 1kb] [Cargo.lock toml 2kb] [file.json json 3kb]] | select $rows

Notes

This differs from get in that, rather than accessing the given value in the data structure, it removes all non-selected values from the structure. Hence, using select on a table will produce a table, a list will produce a list, and a record will produce a record.