# 17.4.6 zset类型

* sorted set，有序集合
* 元素为string类型
* 元素具有唯⼀性，不重复
* 每个元素都会关联⼀个double类型的score，表示权重，通过权重将元素从⼩到⼤排序
* 说明：没有修改操作

增加

* 添加

zadd key score1 member1 score2 member2 ...

* 例1：向键'a4'的集合中添加元素'lisi'、'wangwu'、'zhaoliu'、'zhangsan'，权重分别为4、5、6、3

zadd a4 4 lisi 5 wangwu 6 zhaoliu 3 zhangsan

获取

* 返回指定范围内的元素
* start、stop为元素的下标索引
* 索引从左侧开始，第⼀个元素为0
* 索引可以是负数，表示从尾部开始计数，如-1表示最后⼀个元素

zrange key start stop

* 例2：获取键'a4'的集合中所有元素

zrange a4 0 -1

![Image](https://github.com/clay-wangzhi/wiki/tree/46b947765d64b8562206df9ac2bae98e26b90b86/17%20Redis/17.4%20数据库操作/images/d51d2cc04a77254715187c3ed86783ee5471208b.png)

* 返回score值在min和max之间的成员

zrangebyscore key min max

* 例3：获取键'a4'的集合中权限值在5和6之间的成员

zrangebyscore a4 5 6

![Image](https://github.com/clay-wangzhi/wiki/tree/46b947765d64b8562206df9ac2bae98e26b90b86/17%20Redis/17.4%20数据库操作/images/3b3ce46d97ddb55d280ebbb661416102bd7a0eba.png)

* 返回成员member的score值

zscore key member

例4：获取键'a4'的集合中元素'zhangsan'的权重

zscore a4 zhangsan

![Image](https://github.com/clay-wangzhi/wiki/tree/46b947765d64b8562206df9ac2bae98e26b90b86/17%20Redis/17.4%20数据库操作/images/a120501b5171b6f07623fb5a8e94cc7f2dbf6153.png)

删除

* 删除指定元素

zrem key member1 member2 ...

* 例5：删除集合'a4'中元素'zhangsan'

zrem a4 zhangsan

![Image](https://github.com/clay-wangzhi/wiki/tree/46b947765d64b8562206df9ac2bae98e26b90b86/17%20Redis/17.4%20数据库操作/images/bc2c8e2f03048ef7ce072e95422b72fe9105967c.png)

* 删除权重在指定范围的元素

zremrangebyscore key min max

* 例6：删除集合'a4'中权限在5、6之间的元素

zremrangebyscore a4 5 6

![Image](https://github.com/clay-wangzhi/wiki/tree/46b947765d64b8562206df9ac2bae98e26b90b86/17%20Redis/17.4%20数据库操作/images/4f641cf541b778179cf2e44f7183fb58eb6dc14a.png)


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