In Redis, the ZCARD command returns the cardinality (number of elements) of a sorted set.
Category: Redis
Redis ZINTERSTORE Command Explained
In Redis, the ZINTERSTORE command computes the intersection of the specified sorted sets and stores the result in the specified key. It works the same as the ZINTER command, except that it stores the result instead of returning it.
If the destination key already exists, it’s overwritten.
Continue readingRedis ZINTER Command Explained
In Redis, the ZINTER command returns the intersection of the specified sorted sets. In other words, it returns only those members that are present in all sorted sets.
Fix “WRONGTYPE Operation against a key holding the wrong kind of value” when using LRANGE in Redis
If you get an error that reads “WRONGTYPE Operation against a key holding the wrong kind of value” when using the LRANGE command, it’s probably because you’re passing a key with the wrong data type.
To fix this issue, be sure that the key you pass to the LRANGE command holds a list.
Redis ZDIFFSTORE Command Explained
In Redis, the ZDIFFSTORE command computes the difference between the first and all successive input sorted sets and stores the result in the specified key.
ZDIFFSTORE works in the same way as the ZDIFF command, except that it stores the result instead of returning it (ZDIFF returns the result instead of storing it in a new key).
Redis ZDIFF Command Explained
In Redis, the ZDIFF command returns the difference between the first and all successive input sorted sets.
Redis ZCOUNT Command Explained
In Redis, the ZCOUNT command returns the number of elements in a sorted set with a score between two given values.
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 reading