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Redis – Sorted Sets

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Redis Sorted Sets are similar to Redis Sets with the unique feature of values stored in a set. The difference is, every member of a Sorted Set is associated with a score, that is used in order to take the sorted set ordered, from the smallest to the greatest score.

In Redis sorted set, add, remove, and test for the existence of members in O(1) (constant time regardless of the number of elements contained inside the set). Maximum length of a list is 232 – 1 elements (4294967295, more than 4 billion of elements per set).

Example

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

In the above example, three values are inserted with its score in Redis sorted set named ‘Adglob’ by the command ZADD.

Redis Sorted Sets Commands

Following table lists some basic commands related to sorted sets.

1ZADD key https://adglob.in/blog/redis-sorted-set-zadd-command/
Adds one or more members to a sorted set, or updates its score, if it already exists
2ZCARD keyhttps://adglob.in/blog/redis-sorted-set-zcard-command/
Gets the number of members in a sorted set
3ZCOUNT key https://adglob.in/blog/redis-sorted-set-zcount-command/
Counts the members in a sorted set with scores within the given values
4ZINCRBY keyhttps://adglob.in/blog/redis-sorted-set-zincrby-command/
Increments the score of a member in a sorted set
5ZINTERSTORE https://adglob.in/blog/redis-sorted-set-zinterstore-command/
Intersects multiple sorted sets and stores the resulting sorted set in a new key
6ZLEXCOUNT keyhttps://adglob.in/blog/redis-sorted-set-zlexcount-command/
Counts the number of members in a sorted set between a given lexicographical range
7ZRANGE key https://adglob.in/blog/redis-sorted-set-zrange-command/
Returns a range of members in a sorted set, by index
8ZRANGEBYLEX keyhttps://adglob.in/blog/redis-sorted-set-zrangebylex-command/
Returns a range of members in a sorted set, by lexicographical range
9ZRANGEBYSCORE keyhttps://adglob.in/blog/redis-sorted-set-zrangebyscore-command/
Returns a range of members in a sorted set, by score
10ZRANK keyhttps://adglob.in/blog/redis-sorted-set-zrank-command/
Determines the index of a member in a sorted set
11ZREM keyhttps://adglob.in/blog/redis-sorted-set-zrank-command-2/
Removes one or more members from a sorted set
12ZREMRANGEBYLEX key https://adglob.in/blog/redis-sorted-set-zremrangebylex-command/
Removes all members in a sorted set between the given lexicographical range
13ZREMRANGEBYRANK key https://adglob.in/blog/redis-sorted-set-zremrangebyrank-command/
Removes all members in a sorted set within the given indexes
14ZREMRANGEBYSCORE key https://adglob.in/blog/redis-sorted-set-zremrangebyscore-command/
Removes all members in a sorted set within the given scores
15ZREVRANGE key https://adglob.in/blog/redis-sorted-set-zrevrange-command/
Returns a range of members in a sorted set, by index, with scores ordered from high to low
16ZREVRANGEBYSCORE keyhttps://adglob.in/blog/redis-sorted-set-zrevrangebyscore-command/
Returns a range of members in a sorted set, by score, with scores ordered from high to low
17ZREVRANK keyhttps://adglob.in/blog/redis-sorted-set-zrevrank-command/
Determines the index of a member in a sorted set, with scores ordered from high to low
18ZSCORE keyhttps://adglob.in/blog/redis-sorted-set-zscore-command/
Gets the score associated with the given member in a sorted set
19ZUNIONSTORE https://adglob.in/blog/redis-sorted-set-zunionstore-command/
Adds multiple sorted sets and stores the resulting sorted set in a new key
20ZSCAN key cursor https://adglob.in/blog/redis-sorted-set-zscan-command/
Incrementally iterates sorted sets elements and associated scores

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