SDIFF

Syntax

1. SDIFF key [key ...]

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

ACL categories: @read, @set, @slow

Returns the members of the set resulting from the difference between the first set and all the successive sets.

For example:

1. key1 = {a,b,c,d}
2. key2 = {c}
3. key3 = {a,c,e}
4. SDIFF key1 key2 key3 = {b,d}

Keys that do not exist are considered to be empty sets.

Return

Array reply: list with members of 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> SDIFF key1 key2
14. 1) "b"
15. 2) "a"