Redis set (Set)

Redis is an unordered collection of Set string type. It is the only member of the collection, which means that the collection can not duplicate data.

Redis is set by the hash table to achieve, so add, delete, find the complexity is O (1).

Set the maximum number of members ^232--1 (4294967295 Each set can store more than 40 million members).

Examples

redis 127.0.0.1:6379> SADD w3bigkey redis
(integer) 1
redis 127.0.0.1:6379> SADD w3bigkey mongodb
(integer) 1
redis 127.0.0.1:6379> SADD w3bigkey mysql
(integer) 1
redis 127.0.0.1:6379> SADD w3bigkey mysql
(integer) 0
redis 127.0.0.1:6379> SMEMBERS w3bigkey

1) "mysql"
2) "mongodb"
3) "redis"

In the example above weSADD command to the collection named w3bigkey insertion of three elements.

Redis command set

The following table lists the Redis set of basic commands: