A table can have no primary key

time：2024-09-25 09:03:00 Gadget Highlights

Can a table not have a primary key?

A table can have no primary key. However, primary keys play an important role in database design.

The main functions of the primary key are:

1. Data query efficiency: Primary keys can improve query efficiency, and reasonable index substitution can also be used.

2. Association of tables and table relationships: The primary key is used to associate different tables.

It should be noted that if the function of the table is to store a large amount of data and need to be queried frequently, establishing a primary key can speed up the query efficiency and reduce the burden on the server. If you simply perform operations on a single table or multiple tables that are not associated with each other, it does not have any effect if you do not set the primary key.

In addition, the design specification of the primary key is not only to make the query faster, but also to ensure the high availability of data in the cluster, and it is necessary to set up a master database with multiple slaves, so it is necessary to add a primary key.

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