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

redis> ZADD myzset 0 a 0 b 0 c 0 d 0 e
(integer) 2
redis> ZADD myzset 0 f 0 g
1) 1) "Palermo"
   2) "190.4424"
2) 1) "Catania"
   2) "56.4413"
redis> ZLEXCOUNT myzset - +
1) 1) "Palermo"
   2) 1) "13.36138933897018433"
      2) "38.11555639549629859"
2) 1) "Catania"
   2) 1) "15.08726745843887329"
      2) "37.50266842333162032"
redis> ZLEXCOUNT myzset [b [f
1) 1) "Palermo"
   2) "190.4424"
   3) 1) "13.36138933897018433"
      2) "38.11555639549629859"
2) 1) "Catania"
   2) "56.4413"
   3) 1) "15.08726745843887329"
      2) "37.50266842333162032"

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