SADD key member [member ...]
SREM key member [member ...]
SISMEMBER key member
SMISMEMBER key member [member ...]
SCARD key
SMEMBERS key
SCAN key cursor [MATCH pattern] [COUNT count]
SMOVE source destination member
SPOP key [count]
SRANDMEMBER key [count]
# 集合操作
SUNION key [key ...]
SUNIONSTORE destination key [key ...]
SINTER key [key ...]
SINTERSTORE destination key [key ...]
SDIFF key [key ...]
SDIFFSTORE destination key [key ...]
SINTERCARD numkeys key [key ...] [LIMIT limit]
数据结构
Set数据结构是Dict字典，字典使用哈希表实现的。Java中的HashSet的内部实现使用的是HashMap，只不过所有的Value都指向了同一个对象。Redis的Set结构也是一样的，它的内部也使用Hash结构，所有的value都指向同一个内部值。