In Redis, we can use the SISMEMBER command to find out whether or not a set contains a given member.
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Redis SINTERCARD Command Explained
In Redis, the SINTERCARD command returns the cardinality of the set which would result from the intersection of all the given sets. It’s similar to SINTER, but instead of returning the result set, it returns just the cardinality of the result.
The SINTERCARD command was introduced in Redis 7.0.0.
Redis SINTERSTORE Command Explained
In Redis, the SINTERSTORE command is the same as the SINTER command, except that it stores the result in the specified key, instead of returning it.
It stores the members of the set resulting from the intersection of all the given sets.
If the destination key already exists, it’s overwritten. If it doesn’t exist, it’s created and the resulting members are added to it.
Continue readingRedis SINTER Command Explained
In Redis, the SINTER command returns the members of the set resulting from the intersection of all the given sets.
Redis SDIFFSTORE Command Explained
In Redis, the SDIFFSTORE command works just like the SDIFF command, except that instead of returning the result, it stores it in the key that we specify. The destination key will then hold the members of the set resulting from the difference between the first set and all the successive sets.
Redis SDIFF Command Explained
In Redis, the SDIFF command returns the members of the set resulting from the difference between the first set and all the successive sets. In other words, it returns all members of the first set that aren’t in any of the successive sets.
Redis SCARD Command Explained
In Redis, the SCARD command returns the number of members in the specified set. This is referred to as the cardinality of the set.
Redis SADD Command Explained
In Redis, the SADD command allows us to add members to a key. We can add multiple members if required.
A Redis set is an unordered collection of unique strings (members).
Continue readingRedis OBJECT IDLETIME Command Explained
In Redis, we can use the OBECT IDLETIME command to check how many seconds has passed since the last access to a given key.
SQLite CASE Expression
In SQLite, the CASE expression compares a list of conditions and returns one of multiple possible expressions.
The CASE expression is included in the SQL standard (ISO/IEC 9075), and most major RDBMSs support it.