ZCOUNT key min max

Available since 2.0.0.

Time complexity: O(log(N)) with N being the number of elements in the sorted set.

Returns the number of elements in the sorted set at key with a score between min and max.

The min and max arguments have the same semantic as described for ZRANGEBYSCORE.

Note: the command has a complexity of just O(log(N)) because it uses elements ranks (see ZRANK) to get an idea of the range. Because of this there is no need to do a work proportional to the size of the range.

*Return value

Integer reply: the number of elements in the specified score range.

*Examples

redis>  ZADD myzset 1 "one" 
(integer) 1
redis>  ZADD myzset 2 "two" 
(integer) 1
redis>  ZADD myzset 3 "three" 
(integer) 1
redis>  ZCOUNT myzset -inf +inf 
(integer) 3
redis>  ZCOUNT myzset (1 3 
(integer) 2
redis>