ZCARD key

Available since 1.2.0.

Time complexity: O(1)

Returns the sorted set cardinality (number of elements) of the sorted set stored at key.

*Return value

Integer reply: the cardinality (number of elements) of the sorted set, or 0 if key does not exist.

*Examples

redis> ZADD myzset 1 "one" 

  1. (integer) 1

redis> ZADD myzset 2 "two" 

  1. (integer) 1

redis> ZCARD myzset 

  1. (integer) 2
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