Redis Set (collection)

Redis's set is an unordered collection of type string. A collection member is unique, which means that the collection cannot have duplicate data.

The collection in Redis is represented by a hash table, so the complexity of adding, deleting, and finding is O (1).

The maximum number of members in the collection is 2^32-1 (4294967295, each collection can store 40多亿个 members).

Example

Edis 127.0.0.1:6379> Sadd runoobkey redis
(integer) 1
redis 127.0.0.1:6379> sadd runoobkey MongoDB
( Integer) 1
redis 127.0.0.1:6379> sadd runoobkey mysql
(integer) 1
redis 127.0.0.1:6379> sadd Runoobkey mysql
(integer) 0
redis 127.0.0.1:6379> smembers runoobkey

1) "MySQL"
2) "MongoDB"
3) "Redis"

In the above example we have inserted three elements into the collection named Runoobkey through the Sadd command.

Redis Set (collection) command