原文

http://redis.io/commands/zrevrangebylex

简介

Return a range of members in a sorted set, by lexicographical range, ordered from higher to lower strings.

根据词典范围，返回有序集合中一定范围内的元素，按照字符串由高到低。

语法

ZREVRANGEBYLEX key max min [LIMIT offset count]

版本

Available since 2.8.9.

自2.8.9版本可用。

时间复杂度

Time complexity: O(log(N)+M) with N being the number of elements in the sorted set and M the number of elements being returned. If M is constant (e.g. always asking for the first 10 elements with LIMIT), you can consider it O(log(N)).

O(log(N)+M)：N是有序集合中元素的数量，M是返回的元素的数量。如果M是常量，你可以认为时间复杂度为O(log(N))。

描述

When all the elements in a sorted set are inserted with the same score, in order to force lexicographical ordering, this command returns all the elements in the sorted set at key with a value between max and min.

当有序集合中插入的所有元素的分数都相同时，为了强制词典排序，这个命令返回值在max和min之间的所有元素。

Apart from the reversed ordering, ZREVRANGEBYLEX is similar to ZRANGEBYLEX.

除了颠倒顺序，ZREVRANGEBYLEX与ZRANGEBYLEX是相似的。

返回值

Array reply: list of elements in the specified score range.

Array：指定范围的元素列表。

例子

redis>  ZADD myzset 0 a 0 b 0 c 0 d 0 e 0 f 0 g
(integer) 7
redis>  ZREVRANGEBYLEX myzset [c -
1) "c"
2) "b"
3) "a"
redis>  ZREVRANGEBYLEX myzset (c -
1) "b"
2) "a"
redis>  ZREVRANGEBYLEX myzset (g [aaa
1) "f"
2) "e"
3) "d"
4) "c"
5) "b"
redis>