Sorted sets

ZSETs提供存储一组members到scores的mapping的功能(类似于HASHses中的keys和values的关系)。这些mapping允许我们操控数字scores，获取和检索members和scores，和基于scores排序。

一些`ZSET`常用命令

命令	用法示例和描述
ZADD	ZADD key-name score member [score member ...] —— 将members和scores增加到`ZSET`
ZRED	ZREM key-name member [member ...] —— 从ZSET中移除指定members，返回移除的members数量
ZCARD	ZCARD key-name —— 返回ZSET中的members数量
ZINCRBY	ZINCRBY key-name increment member —— 在ZSET中增加member的score
ZCOUNT	ZCOUNT key-name min max —— 返回指定最小值和最大值之间的members数量
ZRANK	ZRANK key-name member —— 返回ZSET中指定member的坐标
ZSCORE	ZSCORE key-name member —— 返回ZSET中member的score
ZRANGE	ZRANGE key-name start stop [WITHSCORES] —— 从start和stop范围内返回members和可选的scores

命令	用法示例和描述
ZREVRANK	ZREVRANK key-name member —— 返回逆序排序的member的序号
ZREVANGE	ZREVRANGE key-name start stop [WITHSCORES] —— 获取给定范围的members，以逆序排列
ZRANGEBYSCORE	ZRANGEBYSCORE key min max [WITHSCORES] [LIMIT offset count] —— 获取min和max之间的members
ZREVRANGEBYSCORE	ZREVRANGEBYSCORE key max min [WITHSCORES] [LIMIT offset count] —— 获取逆序排序的min和max之间的members
ZREMRANGEBYRANK	ZREMRANGEBYRANK key-name start stop —— 删除起始范围内的items
ZREMRANGEBYSCORE	ZREMRANGEBYRANK key-name min max —— 删除在min和max之间的scores的items
ZINTERSTORE	ZINTERSTORE dest-key key-count key [key ...] [WEIGHTS weight [weight ...]] [AGGREGATE SUM	MIN	MAX] —— Performs a SET -like intersection of the provided ZSETs
ZUNIONSTORE	ZUNIONSTORE dest-key key-count key [key ...] [WEIGHTS weight [weight ...]] [AGGREGATE SUM	MIN	MAX] —— Perform a SET-like union of the provided ZSETs