ZCOUNT key min max

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 with a score between and .

Note: the command has a complexity of just O(log(N)) because it uses elements ranks (see ) 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.

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

*Examples

redis> ZADD myzset 2 "two"

redis> ZADD myzset 3 "three"

redis> ZCOUNT myzset (1 3