Redis sdiffstore 命令

SDIFFSTORE destination key [key …]

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.

*实例

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"

redis>