The essay analyzes the fundamental reason behind slow SQL statements and provides the solution to make improvements through code samples. It is common to associate two tables, like an orders table and ...

The difference between a composite key, a foreign key and a primary key is a good illustration of the complex nature of relational database standards.

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement.

Looks like junction tables are completely ignored and inaccessible through Directus UI/API due to having composite keys. During the initialization of Directus, the following warning message is shown ...

Learn how to add and remove Primary Keys from an Access database table. The primary key's purpose is to promptly associate data from multiple tables and combine that data.

If screaming speed in data access is the most important thing in your life, SQL Server's durable in-memory, memory-optimized tables are your answer. They were good in SQL Server 2014 and they're even ...

Sql keys play a very important role in database related task in sql like retrieve data/record from the table according to the requirement. a key can be defined as a single or combination of multiple ...