SQL Server多主键使用实践及其优势（sqlserver多主键）

Recently, more and more enterprises have chosen to use SQL Server’s multi-primary key. So what exactly is a multi-primary key and what are its advantages? Let’s take a look.

Multi-primary key is a new feature introduced by Microsoft SQL Server in the 2008 version and above. It can save enterprises a lot of development time and enhance the safety of the system, which is why it has been favored by many enterprises. In short, multi-primary key is a combination of two or more columns in a table, each of which functions as a primary key.

For example, in a car brand table, you can set the brand name and the original country where the brand is located as a multi-primary key. In this way, you can distinguish between the same brand names with different sources. In a word, the combination of multiple columns can enforce data integrity and uniqueness, and provide better performance in the query.

The use of multi-primary key is quite simple. First, in the SQL Server Management Studio (SSMS), after creating a table in a new database, select the columns to set as the primary key. Then, in the “View Table Design” tab, click the primary key icon in the header. Finally, check the checkable boxes for multiple columns to become the multi-primary key.

In addition, the SQL Server supports primary key constraints. Primary keys can enforce data integrity. These constraints ensure that the data in a table meets the integrity requirement. Also, they can increase the performance of some queries, guaranteeing the system to run faster.

In summary, multi-primary key is a very useful feature in SQL Server, and its use can bring great advantages. It can save the development staff a lot of time, increase the performance of the system, and ensure the correctness of the data. I believe that in the near future, more and more enterprises will continue to use this feature.