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.
In SQL Server we can query the sys.parameters system catalog view to return all parameters that belong to user-defined objects.
For system objects, we can query the sys.system_parameters view. We can alternatively query the sys.all_parameters system catalog view to return all parameters that belong to either user-defined or system objects.
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.
In SQL Server we can create synonyms, which allow us to provide an alternative name for a database object. Once created, we can reference the synonym instead of the object itself.
If you’re getting an error that reads something like “ERROR 1050 (42S01): Table ‘customers’ already exists” when trying to create a table in MySQL, it’s probably because there’s already a table in the database with the same name.
To fix this issue, either change the name of the table you’re trying to create, or check the existing table to see if it’s the one you actually need.
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.
We have several options when it comes to using SQL to clone a table in MariaDB. And we have the option to clone the table with data, or without data.
Here are three SQL options for cloning a table in MariaDB.
In SQL Server, we can query the sys.default_constraints system catalog view to return a list of DEFAULT constraints in the current database.
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.
SQL Server supports sequences. Sequences enable us to create our own sequence of numeric values.
Sequences are similar to identity columns in that they generate a unique value that can be used to identify a column. However, sequences are created completely independently of any table.