Redis

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.

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"
redis> 
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