SDIFF

SDIFF

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.

Return

Array reply: list with members of the resulting set.

Examples

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