ZDIFF

Syntax

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

Time complexity: : O(L + K log K) worst case where L is the total number of elements in all the sets, 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

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

Examples

  1. dragonfly> ZADD zset1 1 "one"
  2. (integer) 1
  3. dragonfly> ZADD zset1 2 "two"
  4. (integer) 1
  5. dragonfly> ZADD zset1 3 "three"
  6. (integer) 1
  7. dragonfly> ZADD zset2 1 "one"
  8. (integer) 1
  9. dragonfly> ZADD zset2 2 "two"
  10. (integer) 1
  11. dragonfly> ZDIFF 2 zset1 zset2
  12. 1) "three"