redis学习---set操作

set操作

set是无序不重复集合
set的操作：
sadd key element
smembers key 查看指定set的所有值
scard key 获取set集合中的个数
srem 移除Set集合中的某个元素
set中的值不会重复，当插入的值已存在，则不再插入，返回0
srandmember 随机产生指定集合中的指定数量的值
spop 随机和删除集合中的指定数量的元素
smove 移动一个集合中的元素到另一个集合
sdiff 取两个集合的差集
sinter 取两个集合交集 共同好友实现
sunion 取两个集合并集

172.17.0.3:6379> SMEMBERS list
(error) WRONGTYPE Operation against a key holding the wrong kind of value
172.17.0.3:6379> SCAN myset
(error) ERR invalid cursor
172.17.0.3:6379> SCrd myset
(error) ERR unknown command `SCrd`, with args beginning with: `myset`, 
172.17.0.3:6379> SCRD myset
(error) ERR unknown command `SCRD`, with args beginning with: `myset`, 
172.17.0.3:6379> scard myset
(integer) 4
172.17.0.3:6379> srem myset hello
(integer) 1
172.17.0.3:6379> SMEMBERS myset
1) "hello3"
2) "hello1"
3) "hello2"
172.17.0.3:6379> SRANDMEMBER myset 3
1) "hello3"
2) "hello1"
3) "hello2"
172.17.0.3:6379> SRANDMEMBER myset 1
1) "hello1"
172.17.0.3:6379> SRANDMEMBER myset 1
1) "hello2"
172.17.0.3:6379> SRANDMEMBER myset 1
1) "hello3"
172.17.0.3:6379> SRANDMEMBER myset 1
1) "hello2"
172.17.0.3:6379> 
172.17.0.3:6379> spop myset 1
1) "hello2" 
172.17.0.3:6379> clear
172.17.0.3:6379> keys *
1) "list"
2) "myset"
172.17.0.3:6379> sadd myset2 a1 a2 a3 a4 a5
(integer) 5
172.17.0.3:6379> smove myset2 myset a1 a2
(error) ERR wrong number of arguments for 'smove' command
172.17.0.3:6379> smove myset2 myset a1
(integer) 1
172.17.0.3:6379>