Redis sdiff 命令

SDIFF key [key …]

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.

*返回值

Array reply: list with members of 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>  SDIFF key1 key2

1) "a"
2) "b"

redis>