SDIFFSTORE – Redis

始于1.0.0可用。

时间复杂度： 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.

返回值

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

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"