SADD

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.

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 value

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

History

  • >= 2.4: Accepts multiple member arguments. Redis versions before 2.4 are only able to add a single member per call.

Examples

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

© 2009–2020 Salvatore Sanfilippo
Licensed under the Creative Commons Attribution-ShareAlike License 4.0.
https://redis.io/commands/sadd