Set（集合）
set的值是不可重复的！

127.0.0.1:6379> SADD myset "lixin,hello"  #set集合中添加匀速
(integer) 1
127.0.0.1:6379> SADD myset "lilin,hello"
(integer) 1
127.0.0.1:6379> SMEMBERS myset   #查看指定set的所有值
1) "lixin,hello"
2) "lilin,hello"
127.0.0.1:6379> SISMEMBER myset lixin,hello  #判断某一个值是不是在set集合中！
(integer) 1
127.0.0.1:6379> SISMEMBER myset lilin,hello
(integer) 1

127.0.0.1:6379> scard myset #获取set集合中的内容元素个数
(integer) 2
127.0.0.1:6379> SADD myset "hello"
(integer) 1
127.0.0.1:6379> SADD myset "world"
(integer) 1
127.0.0.1:6379> scard myset
(integer) 4
127.0.0.1:6379> 

REM : 移动set集合中的指定元素

127.0.0.1:6379> SREM myset hello 
(integer) 1
127.0.0.1:6379> scard myset
(integer) 3
127.0.0.1:6379> SMEMBERS myset
1) "lixin,hello"
2) "world"
3) "lilin,hello"
127.0.0.1:6379> 

Set无序不重复集合，抽随机

SRANDMEMBER ：随机抽选出一个元素

127.0.0.1:6379> SRANDMEMBER myset
"lixin,hello"
127.0.0.1:6379> SRANDMEMBER myset
"lilin,hello"
127.0.0.1:6379> SRANDMEMBER myset
"lilin,hello"
127.0.0.1:6379> 
127.0.0.1:6379> SRANDMEMBER myset
"lixin,hello"
127.0.0.1:6379> SRANDMEMBER myset
"world"

SPOP：删除指定的key,随机删除key!

127.0.0.1:6379> SMEMBERS myset
1) "lixin,hello"
2) "world"
3) "lilin,hello"
127.0.0.1:6379> spop myset #随机删除一些set集合中的元素！
"lilin,hello"
127.0.0.1:6379> spop myset
"world"
127.0.0.1:6379> SMEMBERS myset
1) "lixin,hello"
127.0.0.1:6379> 

将一个指定的值，移动到另外一个

127.0.0.1:6379> SADD myset "a"
(integer) 1
127.0.0.1:6379> SADD myset "b"
(integer) 1
127.0.0.1:6379> SADD myset "c"
(integer) 1
127.0.0.1:6379> SADD myset "e"
(integer) 1
127.0.0.1:6379> SADD myset2 "e"
(integer) 1
127.0.0.1:6379> smove myset myset2 "a" #将一个指定的值，移动到另一个set集合！
(integer) 1
127.0.0.1:6379> SMEMBERS mysetw
(empty array)
127.0.0.1:6379> SMEMBERS myset2
1) "a"
2) "e"
127.0.0.1:6379> SMEMBERS myset
1) "c"
2) "b"
3) "e"
127.0.0.1:6379> 

• 微博，B站，共同关注
• 数字集合类：
• 交集 SUNION
• 并集 SINTER
• 差集 SDIFF

127.0.0.1:6379> SMEMBERS myset
1) "c"
2) "b"
3) "e"
127.0.0.1:6379> SADD myset3 "e"
(integer) 1
127.0.0.1:6379> SADD myset3 "f"
(integer) 1
127.0.0.1:6379> SADD myset3 "g"
(integer) 1
127.0.0.1:6379> SDIFF myset myset3
1) "b"
2) "c"
127.0.0.1:6379> sinter myset myset3
1) "e"
127.0.0.1:6379>