ZCARD

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Synopsis

ZCARD keyThis 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

You can do this as shown below.

1. $ ZADD z_key 1.0 v1 2.0 v2

1. (integer) 2

1. $ ZADD z_key 3.0 v2

1. (integer) 0

1. $ ZCARD z_key

1. (integer) 2

1. $ ZCARD ts_key

1. (integer) 0

See Also

zadd, zrange, zrangebyscore, zrem, zrevrange