根據b站up主狂神說redis課程所寫的個人學習筆記
set中的值是不能重複的
127.0.0.1:6379> sadd myset "hello" #set集合中新增元素
(integer) 1
127.0.0.1:6379> sadd myset "lin"
(integer) 1
127.0.0.1:6379> sadd myset "love"
(integer) 1
127.0.0.1:6379> smembers myset #檢視指定set的所有值
1) "love"
2) "lin"
3) "hello"
127.0.0.1:6379> sismember myset hello #判斷某個值是不是在set集合中
(integer) 1
127.0.0.1:6379> sismember myset hello1
(integer) 0
127.0.0.1:6379> scard myset #獲取set集合中的元素個數
(integer) 4
127.0.0.1:6379> srem myset hello #移除set集合中的指定元素
(integer) 1
127.0.0.1:6379> scard myset
(integer) 3
127.0.0.1:6379> smembers myset
1) "love"
2) "lin"
3) "love1"
set是無序不重複集合
127.0.0.1:6379> srandmember myset #隨機抽取乙個元素
"love"
127.0.0.1:6379> srandmember myset
"love1"
127.0.0.1:6379> srandmember myset
"love1"
127.0.0.1:6379> srandmember myset 2 #隨機抽取指定個數的元素
1) "lin"
2) "love1"
127.0.0.1:6379> srandmember myset 2
1) "lin"
2) "love"
刪除指定的key，隨機刪除key
127.0.0.1:6379> smembers myset
1) "love"
2) "lin"
3) "love1"
127.0.0.1:6379> spop myset
"lin"
127.0.0.1:6379> spop myset
"love"
127.0.0.1:6379> smembers myset
1) "love1"
將乙個指定的值，移動到另外乙個set中
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> sadd myset "lin"
(integer) 1
127.0.0.1:6379> sadd myset2 "set2"
(integer) 1
127.0.0.1:6379> smove myset myset2 lin
(integer) 1
127.0.0.1:6379> smembers myset
1) "world"
2) "hello"
3) "love1"
127.0.0.1:6379> smembers myset2
1) "lin"
2) "set2"
微博，b站共同關注（並集)
-差集-並集-交集
127.0.0.1:6379> sadd key1 a
(integer) 1
127.0.0.1:6379> sadd key1 b
(integer) 1
127.0.0.1:6379> sadd key1 c
(integer) 1
127.0.0.1:6379> sadd key2 c
(integer) 1
127.0.0.1:6379> sadd key2 d
(integer) 1
127.0.0.1:6379> sadd key2 e
(integer) 1
127.0.0.1:6379> sdiff key1 key2 #差集
1) "a"
2) "b"
127.0.0.1:6379> sinter key1 key2 #交集
1) "c"
127.0.0.1:6379> sunion key1 key2 #並集
1) "b"
2) "c"
3) "a"
4) "d"
5) "e"
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