Stores the difference of multiple sets in a key.
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.
Integer reply: the number of elements in the resulting set.
O(N) where N is the total number of elements in all given sets.
@set @slow @write
127.0.0.1:6379> SADD key1 "a"
(integer) 1
127.0.0.1:6379> SADD key1 "b"
(integer) 1
127.0.0.1:6379> SADD key1 "c"
(integer) 1
127.0.0.1:6379> SADD key2 "c"
(integer) 1
127.0.0.1:6379> SADD key2 "d"
(integer) 1
127.0.0.1:6379> SADD key2 "e"
(integer) 1
127.0.0.1:6379> SDIFFSTORE key key1 key2
(integer) 2
127.0.0.1:6379> SMEMBERS key
1) "a"
2) "b"
SADD, SCARD, SDIFF, SINTER, SINTERCARD, SINTERSTORE, SISMEMBER, SMEMBERS, SMISMEMBER, SMOVE, SPOP, SRANDMEMBER, SREM, SSCAN, SUNION, SUNIONSTORE.