SDIFFSTORE

Syntax

  1. SDIFFSTORE destination key [key ...]

Time complexity: O(N) where N is the total number of elements in all given sets.

ACL categories: @write, @set, @slow

This command is equal to SDIFF, but instead of returning the resulting set, it is stored in destination.

If destination already exists, it is overwritten.

Return

Integer reply: the number of elements in the resulting set.

Examples

  1. dragonfly> SADD key1 "a"
  2. (integer) 1
  3. dragonfly> SADD key1 "b"
  4. (integer) 1
  5. dragonfly> SADD key1 "c"
  6. (integer) 1
  7. dragonfly> SADD key2 "c"
  8. (integer) 1
  9. dragonfly> SADD key2 "d"
  10. (integer) 1
  11. dragonfly> SADD key2 "e"
  12. (integer) 1
  13. dragonfly> SDIFFSTORE key key1 key2
  14. (integer) 2
  15. dragonfly> SMEMBERS key
  16. 1) "b"
  17. 2) "a"