Redis 服务器中与有序集合相关的命令。
ZADD：添加元素
ZADD 用于将一个或多个带分数的元素添加到有序集合中，返回成功添加到有序集合的元素个数。
当添加元素已在有序集合中时，更新元素的分数使其在有序集合中保持正确的位置。
格式：ZADD key score member [score member ...]
127.0.0.1:6379> ZADD student:weights 63.2 xiaoming 67.5 xiaolei
(integer) 2
127.0.0.1:6379> ZADD student:weights 64.2 xiaoming
(integer) 0
ZSCORE：获取元素的分数
格式：ZSCORE key member
127.0.0.1:6379> ZSCORE student:weights xiaoming
"64.200000000000003"
127.0.0.1:6379> ZSCORE student:weights xiaolei
"67.5"
ZRANGE：获取指定位置区间上的元素
ZRANGE 可以获取指定位置区间上的元素，包括区间的两端。
格式：ZRANGE key min max
127.0.0.1:6379> ZADD student:weights 81.5 xiaopang
(integer) 1
127.0.0.1:6379> ZRANGE student:weights 1 2
1) "xiaolei"
2) "xiaopang"
127.0.0.1:6379> ZRANGE student:weights 2 2
1) "xiaopang"
ZRANGEBYSCORE：获取指定分数区间上的元素
ZRANGEBYSCORE 可指定分数区间获取元素。
+inf 表示正无穷，-inf 表示负无穷。
格式：ZRANGEBYSCORE key min max [WITHSCORES] [LIMIT offset count]
127.0.0.1:6379> ZRANGEBYSCORE student:weights 65 85 WITHSCORES
1) "xiaolei"
2) "67.5"
3) "xiaopang"
4) "81.5"
127.0.0.1:6379> ZRANGEBYSCORE student:weights 65 85 WITHSCORES LIMIT 1 1
1) "xiaopang"
2) "81.5"
127.0.0.1:6379> ZRANGEBYSCORE student:weights 65 85 WITHSCORES LIMIT 1 2
1) "xiaopang"
2) "81.5"
127.0.0.1:6379> ZRANGEBYSCORE student:weights 65 85 WITHSCORES LIMIT 0 2
1) "xiaolei"
2) "67.5"
3) "xiaopang"
4) "81.5"
127.0.0.1:6379> ZRANGEBYSCORE student:weights -inf +inf WITHSCORES
1) "xiaoming"
2) "64.200000000000003"
3) "xiaolei"
4) "67.5"
5) "xiaopang"
6) "81.5"
ZINCRBY：增加某个元素的分数
ZINCRBY 的返回值为修改后的分数。
格式：ZINCRBY key increment member
127.0.0.1:6379> ZINCRBY student:weights 0.5 xiaoming
"64.700000000000003"
127.0.0.1:6379> ZINCRBY student:weights -0.5 xiaoming
"64.200000000000003"
ZCARD：获取集合中元素的个数
格式：ZCARD key
127.0.0.1:6379> ZCARD student:weights
(integer) 3
ZCOUNT：获取指定分数范围内的元素个数
格式：ZCOUNT key min max
127.0.0.1:6379> ZCOUNT student:weights 65 85
(integer) 2
ZREM：删除一个或多个元素
ZREM 返回删除成功的元素个数。
格式：ZREM key member [member ...]
127.0.0.1:6379> ZREM student:weights xiaoming xiaolei
(integer) 2
127.0.0.1:6379> ZREM student:weights notaname
(integer) 0
ZREMRANGEBYRANK：通过指定位置区间删除集合元素
格式：ZREMRANGEBYRANK key start stop
127.0.0.1:6379> ZADD student:weights 63.2 xiaoming 67.5 xiaolei
(integer) 2
127.0.0.1:6379> ZRANGEBYSCORE student:weights -inf +inf WITHSCORES
1) "xiaoming"
2) "63.200000000000003"
3) "xiaolei"
4) "67.5"
5) "xiaopang"
6) "81.5"
127.0.0.1:6379> ZREMRANGEBYRANK student:weights 0 1
(integer) 2
127.0.0.1:6379> ZRANGEBYSCORE student:weights -inf +inf WITHSCORES
1) "xiaopang"
2) "81.5"
ZREMRANGEBYSCORE：通过指定分数区间删除集合元素
格式：ZREMRANGEBYSCORE key min max
127.0.0.1:6379> ZADD student:weights 63.2 xiaoming 67.5 xiaolei 81.5 xiaopang
(integer) 3
127.0.0.1:6379> ZRANGEBYSCORE student:weights -inf +inf WITHSCORES
1) "xiaoming"
2) "63.200000000000003"
3) "xiaolei"
4) "67.5"
5) "xiaopang"
6) "81.5"
127.0.0.1:6379> ZREMRANGEBYSCORE student:weights 80 85
(integer) 1
127.0.0.1:6379> ZRANGEBYSCORE student:weights -inf +inf WITHSCORES
1) "xiaoming"
2) "63.200000000000003"
3) "xiaolei"
4) "67.5"
ZRANK：获取元素的排序
格式：ZRANK key member
127.0.0.1:6379> ZRANK student:weights xiaolei
(integer) 1
127.0.0.1:6379> ZRANK student:weights notaname
(nil)
ZREVRANK：降序获取元素的排序
格式：ZREVRANK key member
127.0.0.1:6379> ZREVRANK student:weights xiaolei
(integer) 0
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