SDIFFSTORE destination key [key …]
Available since 1.0.0.
Time complexity: O(N) where N is the total number of elements in all given sets.
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 value
Integer reply: the number of elements in the resulting set.
*Examples
redis> SADD key1 "a"
- (integer) 1
redis> SADD key1 "b"
- (integer) 1
redis> SADD key1 "c"
- (integer) 1
redis> SADD key2 "c"
- (integer) 1
redis> SADD key2 "d"
- (integer) 1
redis> SADD key2 "e"
- (integer) 1
redis> SDIFFSTORE key key1 key2
- (integer) 2
redis> SMEMBERS key
- 1) "a"
- 2) "b"