ZCARD

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 key is associated with non sorted-set data, an error is returned.

RETURN VALUE

The cardinality of the sorted set.

EXAMPLES

$ 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

SEE ALSO

zadd, zrange, zrangebyscore, zrem, zrevrange

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