Redis zlexcount 命令

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.

*返回值

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

*实例

redis>  ZADD myzset 0 a 0 b 0 c 0 d 0 e

(integer) 5

redis>  ZADD myzset 0 f 0 g

(integer) 2

redis>  ZLEXCOUNT myzset – +

(integer) 7

redis>  ZLEXCOUNT myzset [b [f

(integer) 5

redis>