SDIFF key [key ...]

Available since: 1.0.0

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:

key1 = {a,b,c,d}
key2 = {c}
key3 = {a,c,e}
SDIFF key1 key2 key3 = {b,d}

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


Array reply: list with members of the resulting set.


SADD key1 "a" SADD key1 "b" SADD key1 "c" SADD key2 "c" SADD key2 "d" SADD key2 "e" SDIFF key1 key2