ZDIFF

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.

ACL categories:

@read, @sortedset, @slow,

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

Examples

redis> ZADD zset1 1 "one"
(nil)
redis> ZADD zset1 2 "two"
(integer) 3
redis> ZADD zset1 3 "three"
1) "myzset"
2) 1) 1) "one"
      2) "1"
redis> ZADD zset2 1 "one"
1) "two"
2) "2"
3) "three"
4) "3"
redis> ZADD zset2 2 "two"
1) "myzset"
2) 1) 1) "three"
      2) "3"
   2) 1) "two"
      2) "2"
redis> ZDIFF 2 zset1 zset2
(integer) 3
redis> ZDIFF 2 zset1 zset2 WITHSCORES
1) "myzset2"
2) 1) 1) "four"
      2) "4"
   2) 1) "five"
      2) "5"
   3) 1) "six"
      2) "6"

RESP2/RESP3 Reply

• Array reply: the result of the difference including, optionally, scores when the WITHSCORES option is used.