ZLEXCOUNT key min max

相关命令

Available since 2.8.9.

时间复杂度： O(log(N)) with N being the number of elements in the sorted set.

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.

例子

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

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