ZDIFF numkeys key [key ...] [WITHSCORES]

Available since 6.2.0.

Time complexity: O(L + (N-K)log(N)) worst case where L is the total number of elements in all the sets, N is the size of the first set, and K is the size of the result set.

This command is similar to ZDIFFSTORE, but instead of storing the resulting sorted set, it is returned to the client.

*Return value

Array reply: the result of the difference (optionally with their scores, in case the WITHSCORES option is given).

*Examples

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"
redis>