ZDIFF

Returns the difference between multiple sorted sets.

Usage: ZDIFF numkeys key ... [WITHSCORES withscores]
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.
Since: 6.2.0
ACL Categories: @read, @slow, @sortedset
Command flags: READONLY

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

Examples

127.0.0.1:6379> ZADD zset1 1 "one"
(integer) 1
127.0.0.1:6379> ZADD zset1 2 "two"
(integer) 1
127.0.0.1:6379> ZADD zset1 3 "three"
(integer) 1
127.0.0.1:6379> ZADD zset2 1 "one"
(integer) 1
127.0.0.1:6379> ZADD zset2 2 "two"
(integer) 1
127.0.0.1:6379> ZDIFF 2 zset1 zset2
1) "three"
127.0.0.1:6379> ZDIFF 2 zset1 zset2 WITHSCORES
1) "three"
2) "3"

Replies

RESP2

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

RESP3

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