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count

Syntax

    dataset COLLECTION_NAME count [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 "publications.ds" count

Count records where the .published field is true.

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

Related topic: keys