zlexcount
ZLEXCOUNT
ZLEXCOUNT key min max
When all the elements in a sorted set are inserted with the same score, in order to force lexicographical ordering, this command returns the number of elements in the sorted set at key with a value between min and max.
The min and max arguments have the same meaning as described for ZRANGEBYLEX-
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
