Redis Sorted Sets

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Redis Sorted Sets

Redis sorted sets are similar to sets in that they are collections of string type elements and do not allow duplicate members.

The difference is that each element is associated with a double type score. Redis sorts the members in the set based on these scores.

The members in a sorted set are unique, but the scores can be repeated.

Sets are implemented using hash tables, so the complexity for adding, deleting, and finding elements is O(1). The maximum number of members in a set is 2^32 - 1 (4294967295, each set can store over 4 billion members).

Example

redis 127.0.0.1:6379> ZADD tutorialkey 1 redis
(integer) 1
redis 127.0.0.1:6379> ZADD tutorialkey 2 mongodb
(integer) 1
redis 127.0.0.1:6379> ZADD tutorialkey 3 mysql
(integer) 1
redis 127.0.0.1:6379> ZADD tutorialkey 3 mysql
(integer) 0
redis 127.0.0.1:6379> ZADD tutorialkey 4 mysql
(integer) 0
redis 127.0.0.1:6379> ZRANGE tutorialkey 0 10 WITHSCORES
1) "redis"
2) "1"
3) "mongodb"
4) "2"
5) "mysql"
6) "4"

In the above example, we used the command ZADD to add three values to the Redis sorted set and associate them with scores.

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Redis Sorted Set Commands

The following table lists the basic commands for Redis sorted sets:

Number	Command and Description
1	ZADD key score1 member1 Add one or more members to an ordered set, or update the score of existing members
2	ZCARD key Get the number of members in an ordered set
3	ZCOUNT key min max Count the number of members within a specified score range in an ordered set
4	ZINCRBY key increment member Increment the score of a member in an ordered set