redis的set是string型別的無序集合。集合成員是唯一的，這就意味著集合中不能出現重複的資料。
序號命令及描述
1sadd key member1 [member2] 向集合新增乙個或多個成員
2scard key 獲取集合的成員數
3sdiff key1 [key2] 返回給定所有集合的差集
4sdiffstore destination key1 [key2] 返回給定所有集合的差集並儲存在 destination 中
5sinter key1 [key2] 返回給定所有集合的交集
6sinterstore destination key1 [key2] 返回給定所有集合的交集並儲存在 destination 中
7sismember key member 判斷 member 元素是否是集合 key 的成員
8smembers key 返回集合中的所有成員
9smove source destination member 將 member 元素從 source 集合移動到 destination 集合
10spop key 移除並返回集合中的乙個隨機元素
11srandmember key [count] 返回集合中乙個或多個隨機數
12srem key member1 [member2] 移除集合中乙個或多個成員
13sunion key1 [key2] 返回所有給定集合的並集
14sunionstore destination key1 [key2] 所有給定集合的並集儲存在 destination 集合中
15sscan key cursor [match pattern] [count count] 迭代集合中的元素
127.0.0.1:6379> sadd myset "hello" "world"
(integer) 2
127.0.0.1:6379> sadd myset "hi"
(integer) 1
127.0.0.1:6379> sadd myset "hello"
(integer) 0
127.0.0.1:6379> smembers myset
1) "world"
2) "hello"
3) "hi"
127.0.0.1:6379> sadd myset1 "one"
(integer) 1
127.0.0.1:6379> sadd myset1 "two" "three" "four"
(integer) 3
127.0.0.1:6379> srem myset1 "two"
(integer) 1
127.0.0.1:6379> srem myset1 "one" "four"
(integer) 2
127.0.0.1:6379> smembers myset1
1) "three"
127.0.0.1:6379> sadd myset2 "one" "two" "three"
(integer) 3
127.0.0.1:6379> spop myset2
"one"
127.0.0.1:6379> smembers myset2
1) "three"
2) "two"
127.0.0.1:6379> smembers myset1
1) "three"
2) "four"
127.0.0.1:6379> smembers myset2
1) "three"
2) "two"
127.0.0.1:6379> sdiff myset1 myset2
1) "four"
127.0.0.1:6379> smembers myset1
1) "three"
2) "four"
127.0.0.1:6379> smembers myset2
1) "three"
2) "two"
127.0.0.1:6379> sdiffstore myset3 myset1 myset2
(integer) 1
127.0.0.1:6379> smembers myset3
1) "four"
127.0.0.1:6379> smembers myset1
1) "three"
2) "four"
127.0.0.1:6379> smembers myset2
1) "three"
2) "two"
127.0.0.1:6379> sinter myset1 myset2
1) "three"
127.0.0.1:6379> smembers myset1
1) "three"
2) "four"
127.0.0.1:6379> smembers myset2
1) "three"
2) "two"
127.0.0.1:6379> sinterstore myset4 myset1 myset2
(integer) 1
127.0.0.1:6379> smembers myset4
1) "three"
127.0.0.1:6379> smembers myset1
1) "three"
2) "four"
127.0.0.1:6379> smembers myset2
1) "three"
2) "two"
127.0.0.1:6379> sunion myset1 myset2
1) "three"
2) "four"
3) "two"
127.0.0.1:6379> smembers myset1
1) "three"
2) "four"
127.0.0.1:6379> smembers myset2
1) "three"
2) "two"
127.0.0.1:6379> sunionstore myset5 myset1 myset2
(integer) 3
127.0.0.1:6379> smembers myset5
1) "three"
2) "four"
3) "two"
127.0.0.1:6379> smembers myset1
1) "three"
2) "four"
127.0.0.1:6379> smembers myset5
1) "three"
2) "four"
3) "two"
127.0.0.1:6379> smove myset1 myset6 three
(integer) 1
127.0.0.1:6379> smembers myset6
1) "three"
127.0.0.1:6379> scard myset5
(integer) 3
127.0.0.1:6379> smembers myset2
1) "three"
2) "two"
127.0.0.1:6379> sismember myset2 two
(integer) 1
127.0.0.1:6379> sismember myset2 five
(integer) 0
127.0.0.1:6379> smembers myset2
1) "three"
2) "two"
127.0.0.1:6379> srandmember myset2
"three"
127.0.0.1:6379> srandmember myset2
"three"
127.0.0.1:6379> srandmember myset2
"three"
127.0.0.1:6379> srandmember myset2
"two"
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