四，redis常⽤的数据类型--set和zset set和zset都是集合
set是对string类型的⽆序集合，zset是有序的集合
set中的值是不能重复的；
是否是集合是否有序有序实现⽅式应⽤场景
set是否⽆标签，社交
zset是是分值排⾏系统，社交
⼀，set常⽤指令
set是不允许有重复的值存在的。
1）sadd和smembers t添加set和获取set中的值
2) sismember 还可以判断set中是否包含某个字符串
127.0.0.1:6379> sadd s laoli
(integer) 1
127.0.0.1:6379> sadd s laowang
(integer) 1
127.0.0.1:6379> sadd s laozhang
(integer) 1
127.0.0.1:6379> sadd s laohao
(integer) 1
127.0.0.1:6379> SMEMBERS s
1) "laohao"
2) "laowang"
3) "laozhang"
4) "laoli"
127.0.0.1:6379> SMEMBERS s
1) "laohao"
2) "laowang"
3) "laozhang"
4) "laoli"
127.0.0.1:6379> SISMEMBER s laohao
(integer) 1
127.0.0.1:6379> SISMEMBER s laohao1
(integer) 0
3)scard 返回集合中的元素总数
127.0.0.1:6379> SMEMBERS s
1) "laohao"
2) "laowang"
3) "laozhang"
4) "laoli"
127.0.0.1:6379> scard s
(integer) 4
4）srem移除集合中的⼀个或多个字符串
127.0.0.1:6379> SMEMBERS s
1) "laohao"
2) "laowang"
3) "laozhang"
4) "laoli"
127.0.0.1:6379> srem s laohao laoli
(integer) 2
127.0.0.1:6379> SMEMBERS s
1) "laozhang"
2) "laowang"
5）srandmember 随机抽取集合中的⼀个或者多个元素
127.0.0.1:6379> SMEMBERS s
1) "laowang"
2) "laok"
3) "laozhang"
4) "laoli"
5) "laob"
127.0.0.1:6379> SRANDMEMBER s 1
1) "laowang"
127.0.0.1:6379> SRANDMEMBER s 1
1) "laob"
127.0.0.1:6379> SRANDMEMBER s 1
1) "laozhang"
127.0.0.1:6379> SRANDMEMBER s 2
1) "laozhang"
2) "laoli"
6）spop 移除并返回集合中的⼀个随机元素
spop 应该是随机移除集合中的⼀个元素并且返回⼀个移除的值
127.0.0.1:6379> SMEMBERS s
1) "laozhang"
2) "laowang"
3) "laoli"
4) "laok"
5) "laob"
127.0.0.1:6379> spop s
"laob"
127.0.0.1:6379> spop s
"laowang"
127.0.0.1:6379> SMEMBERS s
1) "laozhang"
2) "laoli"
3) "laok"
7）smove 将⼀个set中的元素移动到另⼀个set中
⽐如，讲s中的test移动到s1中
⽐如在抽奖系统中，讲⼀等奖中奖⽤户放到⼀等奖的名单中，⼆等奖的⽤户放在⼆等奖的名单中。127.0.0.1:6379> SMEMBERS s
1) "laohao"
2) "laozhang"
3) "test"
4) "laowang"
5) "laoli"
6) "laok"
127.0.0.1:6379> SMEMBERS s1
1) "laojiao"
2) "laowang"
3) "laozhang"
4) "laoli"
127.0.0.1:6379> smove s s1 test
(integer) 1
127.0.0.1:6379> SMEMBERS s1
1) "laojiao"
2) "laowang"
3) "laozhang"
4) "laoli"
5) "test"
8）set是⼀个集合，肯定会有交集，并集和差集；
sdiff 查看两个集合不同的元素--差集
sinter 查看两个集合中相同的元素---交集
sunion 两个集合中所有的元素---并集
127.0.0.1:6379> SMEMBERS s
1) "laohao"
2) "laozhang"
3) "laowang"
4) "laoli"
5) "laok"
127.0.0.1:6379> SMEMBERS s1
1) "laojiao"
2) "laowang"
3) "laozhang"
127.0.0.1:6379> sdiff s s1
1) "laohao"
2) "laok"
127.0.0.1:6379> SINTER s s1
1) "laozhang"
2) "laowang"
3) "laoli"
127.0.0.1:6379> SUNION s s1
1) "laohao"
2) "laozhang"
3) "laojiao"
4) "test"
5) "laowang"
6) "laoli"
7) "laok"
⼆，zset的常⽤指令
1）zadd和zrange
zadd是添加元素
zrange是查看元素
127.0.0.1:6379> zadd s 1 laoli
(integer) 1
127.0.0.1:6379> zadd s 2 laowang
(integer) 1
127.0.0.1:6379> zadd s 3 laozhang
redis支持的五种数据类型
(integer) 1
127.0.0.1:6379> zadd s 4 laoxu
(integer) 1
127.0.0.1:6379> zrange s 0 -1
1) "laoli"
2) "laowang"
3) "laozhang"
4) "laoxu"
2）zset的排序指令
⾸先，我们赋值，⽐如下⾯的语⽂分数
127.0.0.1:6379> zadd score_ch 98 laozhang
(integer) 1
127.0.0.1:6379> zadd score_ch 95 laoli
(integer) 1
127.0.0.1:6379> zadd score_ch 93 laowang
(integer) 1
127.0.0.1:6379> zadd score_ch 89 laohao
(integer) 1
①ZRANGEBYSCORE 从低到⾼排序，从数值中可以看到laohao的值分数最低
127.0.0.1:6379> ZRANGEBYSCORE score_ch -inf +inf
1) "laohao"
2) "laowang"
3) "laoli"
4) "laozhang"
127.0.0.1:6379> ZRANGEBYSCORE score_ch -inf +inf withscores
1) "laohao"
2) "89"
3) "laowang"
4) "93"
5) "laoli"
6) "95"
7) "laozhang"
8) "98"
可以查看区间分数，如果不存在的话，就返回empty，如果存在就返回存在区间的值；有集合的地⽅，总会有区间；127.0.0.1:6379> ZRANGEBYSCORE score_ch 1 2
(empty list or set)
127.0.0.1:6379> ZRANGEBYSCORE score_ch 80 94
1) "laohao"
2) "laowang"
127.0.0.1:6379> ZRANGEBYSCORE score_ch 80 94 withscores
1) "laohao"
2) "89"
②zrem 移除集合中的指定元素
127.0.0.1:6379> zrange score_ch 0 -1
1) "laohao"
2) "laowang"
3) "laoli"
4) "laozhang"
127.0.0.1:6379> zrem score_ch laozhang laohao
(integer) 2
127.0.0.1:6379> zrange score_ch 0 -1
1) "laowang"
2) "laoli"
③zrevrange 从⾼到底排序
127.0.0.1:6379> zrevrange score_ch 0 -1 withscores
1) "laoli"
2) "95"
3) "laowang"
4) "93"
④zcount 判断集合区间中有多少值
127.0.0.1:6379> zrange score_ch 0 -1 withscores
1) "sun"
2) "56"
3) "ke"
4) "57"
5) "liu"
6) "65"
7) "laowang"
8) "93"
9) "laoli"
10) "95"
127.0.0.1:6379> zcount score_ch 50 60
(integer) 2
指令可以看出50到60之间的有两个值；
三，应⽤场景
1，zset是可以排序的，我们可以做阅读量排⾏，加权判断，热门等等；
2，set和zset是⼀个集合，可以在集合中给⽤户打不同的标签，多个⽤户中相同点，做好友推荐；共同好友等等；
⽐如，微博中的共同关注等等
127.0.0.1:6379> SMEMBERS s1) "laohao"2) "laozhang"3) "test"4) "laowang"5) "laoli"6) "laok"127.0.0.1:6379> SMEMBERS s11) "laojiao"2) "laowang"3) "laozhang"4) "laoli"127.0.0.1:6379> smove s s1 test(integer) 1127.0.0.1:6379> SMEMBERS s11) "laojiao"2) "laowang"3) "laozhang"4) "laoli"5) "test"
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