ZDIFF numkeys key [key ...] [WITHSCORES]
#Example
redis> ZADD zset1 1 "one"
(integer) 1
redis> ZADD zset1 2 "two"
(integer) 1
redis> ZADD zset1 3 "three"
(integer) 1
redis> ZADD zset2 1 "one"
(integer) 1
redis> ZADD zset2 2 "two"
(integer) 1
redis> ZDIFF 2 zset1 zset2
1) "three"
redis> ZDIFF 2 zset1 zset2 WITHSCORES
1) "three"
2) "3"
Subtract multiple sorted sets
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