ZCARD
This page documents the preview (v2.21) version. Preview includes features under active development and is for development and testing only. For production, use the stable (v2024.1) version.
Synopsis
ZCARD key
This command returns the number of members in the sorted set at key. If key does not exist, 0 is returned.
- If
keyis associated with non sorted-set data, an error is returned.
Return value
The cardinality of the sorted set.
Examples
You can do this as shown below.
$ ZADD z_key 1.0 v1 2.0 v2
(integer) 2
$ ZADD z_key 3.0 v2
(integer) 0
$ ZCARD z_key
(integer) 2
$ ZCARD ts_key
(integer) 0