Speak redis seventh Set

• Single-value multi-value

• sadd / smembers / sismember
  

• scard Get the number of elements inside the collection

• srem key value to delete elements in the collection
  

• srandmember key an integer -> a few random number
  

• spop key randomly pop
  

• smove key1 key2 key1 in a value -> key1 in the role is to assign a value key2
  

Mathematical collections

• 1, difference (sdiff). Rather than items in a first set in which a set back inside any
  

• 2, the intersection (sinter)
  

• 3, and the set (SUNION)
  

Reproduced in: https: //www.jianshu.com/p/55e5512bc451