ZUNIONSTORE

ZUNIONSTORE destination numkeys key [key ...] [WEIGHTS weight [weight ...]] [AGGREGATE SUM|MIN|MAX] 

#Example

redis> ZADD zset1 1 "one" (integer) 1 redis> ZADD zset1 2 "two" (integer) 1 redis> ZADD zset2 1 "one" (integer) 1 redis> ZADD zset2 2 "two" (integer) 1 redis> ZADD zset2 3 "three" (integer) 1 redis> ZUNIONSTORE out 2 zset1 zset2 WEIGHTS 2 3 (integer) 3 redis> ZRANGE out 0 -1 WITHSCORES 1) "one" 2) "5" 3) "three" 4) "9" 5) "two" 6) "10" 

Add multiple sorted sets and store the resulting sorted set in a new key