 Usage:

ZLEXCOUNT key min max
 Complexity:
 O(log(N)) with N being the number of elements in the sorted set.
 Since:
 2.8.9
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.
Examples
127.0.0.1:6379> ZADD myzset 0 a 0 b 0 c 0 d 0 e
(integer) 5
127.0.0.1:6379> ZADD myzset 0 f 0 g
(integer) 2
127.0.0.1:6379> ZLEXCOUNT myzset  +
(integer) 7
127.0.0.1:6379> ZLEXCOUNT myzset [b [f
(integer) 5