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ZLEXCOUNT key min max

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

ACL categories: @read, @sortedset, @fast

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.


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


dragonfly> ZADD myzset 0 a 0 b 0 c 0 d 0 e
(integer) 5
dragonfly> ZADD myzset 0 f 0 g
(integer) 2
dragonfly> ZLEXCOUNT myzset - +
(integer) 7
dragonfly> ZLEXCOUNT myzset [b [f
(integer) 5