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Set

  • Unordered collections of strings
  • SADD adds new elements to a set
  • It's also possible to do a number of other operations against sets like:
    • testing if a given element already exists
    • performing the intersection, union or 
difference between multiple sets, and so forth
127.0.0.1:6379> sadd myset 1 2 3 
(integer) 3
127.0.0.1:6379> smembers myset
1) "1"
2) "2"
3) "3"
127.0.0.1:6379> sismember myset 3
(integer) 1
127.0.0.1:6379>

Set operations UNION etc…

SUNION

Returns the members of the set resulting 
from the union of all the given sets

SINTER

Returns the members of the set resulting 
from the intersection of all the given sets

SDIFF

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 key1 "a" "b" "c"
(integer) 3
127.0.0.1:6379> sadd key2 "c" "d" "e"
(integer) 3
127.0.0.1:6379> sunion key1 key2
1) "a"
2) "b"
3) "c"
4) "e"
5) "d"
127.0.0.1:6379>

127.0.0.1:6379> sdiff key1 key2
1) "a"
2) "b"
127.0.0.1:6379> sdiff key2 key1
1) "e"
2) "d"
127.0.0.1:6379> sinter key1 key2
1) "c"
127.0.0.1:6379>