In Redis, the ZCOUNT command returns the number of elements in a sorted set with a score between two given values.
Tag: commands
Redis ZREVRANK Command Explained
In Redis, the ZREVRANK command returns the rank of the specified element of a sorted set ordered in descending order (from high to low).
If we want the set to be in ascending order, we can use the ZRANK command.
Redis ZRANK Command Explained
In Redis, the ZRANK command returns the rank of the specified element of a sorted set.
The scores are ordered from low to high. If we want them in the opposite order, we can use the ZREVRANK command.
Redis ZRANDMEMBER Command Explained
In Redis, the ZRANDMEMBER command enables us to get one or more random elements from a sorted set.
We can specify whether or not to return only distinct elements or to allow duplicates. We can also specify whether or not to include the scores of each element in the result.
Continue readingRedis ZRANGEBYSCORE Replacement
Starting with Redis 6.2.0, the ZRANGE command added the REV, BYSCORE, BYLEX and LIMIT options. The addition of the first three options means that the ZRANGE command can now do what the ZREVRANGE, ZRANGEBYSCORE, ZREVRANGEBYSCORE, ZRANGEBYLEX and ZREVRANGEBYLEX commands can do.
As a result, those commands are now deprecated (as of Redis 6.2.0).
Therefore, we should no longer use the ZRANGEBYSCORE command when we need to return a sorted set by score. Instead, we should use the ZRANGE command with the BYSCORE argument.
Redis ZRANGE Command Explained
In Redis, the ZRANGE command returns the specified range of elements in the sorted set stored at the specified key.
It can perform different types of range queries: by index (rank), by the score, or by lexicographical order.
Continue readingRedis ZADD Command Explained
In Redis, the ZADD command is used to add one or more members to a sorted set, or to update the score for members that already exist in the sorted set.
It returns the number of elements added to the sorted set, or the number of elements updated if the CH argument is used.
Redis HINCRBYFLOAT Command
The Redis HINCRBYFLOAT command increments the field in the hash at the specified key by a floating point number. We specify how much we want the field to increment by when we call the command.
Redis HINCRBY Command
The Redis HINCRBY command increments the number that’s stored at the specified field in the hash at the specified key. We specify how much we want the field to increment by when we call the command.
Redis HVALS Command
The Redis HVALS command returns all values in the hash stored at the specified key.