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SADD key member [member ...]

Time complexity: O(1) for each element added, so O(N) to add N elements when the command is called with multiple arguments.

ACL categories: @write, @set, @fast

Add the specified members to the set stored at key. Specified members that are already a member of this set are ignored. If key does not exist, a new set is created before adding the specified members.

An error is returned when the value stored at key is not a set.


Integer reply: the number of elements that were added to the set, not including all the elements already present in the set.


dragonfly> SADD myset "Hello"
(integer) 1
dragonfly> SADD myset "World"
(integer) 1
dragonfly> SADD myset "World"
(integer) 0
dragonfly> SMEMBERS myset
1) "Hello"
2) "World"