SADD key member [member ...]

Available since: 1.0.0

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.

@return

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

@examples

redis> SADD myset "Hello"
TBD
redis> SADD myset "World"
TBD
redis> SADD myset "World"
TBD
redis> SMEMBERS myset

History

Starting with Redis version 2.4.0: Accepts multiple member arguments.