ZLEXCOUNT

ZLEXCOUNT key min max

Available since

2.8.9

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.

Examples #

ZADD myzset 0 a 0 b 0 c 0 d 0 e
ZADD myzset 0 f 0 g
ZLEXCOUNT myzset - +
ZLEXCOUNT myzset [b [f