Sorted Set In Redis

In mathematics, especially order theory, a partially ordered set formalizes and generalizes the intuitive concept of an ordering, sequencing, or arrangement of the elements of a set

Redis Sorted Sets are, similarly to Redis Sets, non repeating collections of Strings. The difference is that every member of a Sorted Set is associated with a score, that is used keep the Sorted Set in order, from the smallest to the greatest score. While members are unique, scores may be repeated. Read More

Insertion Commands

1. ZADD This command is used to add elements to the sorted set in the Redis database.

ZADD key score value score value ...

2. ZRANGE This command is for fetching all the elements for a particular key. If we need to fetch all the elements in the sorted set, we can provide -1 in the end field as shown below.

ZRANGE key start end 

3. ZRANGEBYSCORE This command is for fetching the elements in a particular range of scores.

ZRANGEBYSCORE key startScore endScore

4. ZCARD To get the number of elements in the sorted set, ZCARD is used.

ZCARD key 

5. ZCOUNT This command is used to find the number of elements within a certain range of scores.

ZCOUNT key minScore maxScore

Utility Commands

1. ZREM This command is used to remove a member from the sorted set.

ZREM key value

2. ZRANK This command is used to find the index of an element in the sorted set. If the rank of an element is 0, then its score is the lowest

ZRANK key member

3. ZREVRANK This command is used to find the rank from the reverse. If the rank of an element is 0, then the score is the highest.

ZREVRANK key member

4. ZSCORE This command is used to get the score of an element.

ZSCORE key member