NoSQL----集合間の操作

         sinter key [ key ......]
         sunion key [key ......]
         sdiff key [key ......]    key    ，   key     
   、  、       
sinterstore destination key [ key ......]
sunionstore destination key [ key ......]
sdiffstore destination key [ key ......]
  ： sinterstore user:1_2:inter user:1 user:2 user:1_2:incr