Syntax
SDIFF key1 key2 ...keyN
Returns the members of the set
resulting from the difference between the first set and all the
successive sets.
127.0.0.1:6379> sadd set1 2 4 6 8 (integer) 4 127.0.0.1:6379> sadd set2 1 3 5 7 4 6 (integer) 6 127.0.0.1:6379> sadd set3 1 3 5 7 4 (integer) 5 127.0.0.1:6379> sdiff set1 set2 set3 1) "2" 2) "8"
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