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count

Syntax

    dataset count COLLECTION_NAME [FILTER EXPRESSION]

Description

This returns a count of the keys in the collection. It is reasonable quick as only the collection metadata is read in. count also can accept a filter expression. This is slower as it iterates over all the records and counts those which evaluate to true based on the filter expression provided.

Usage

Count all records in collection "publications.ds"

    dataset count "publications.ds"

Count records where the ".published" field is true.

    dataset count "publications.ds" '(eq .published true)'