auto generate primary key sql

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In database design, should I design an auto-incremental ID field as the primary key?

I am a newbie. I have been confused for a long time. Today I decided to ask you the correct or common practices. Here is a simple example: id, title, content ,...... Label table: id. The two tables above the title obviously require auto-incrementing

Thoughts on logical primary key, business primary key, and composite primary key

Reproduced: http://blog.csdn.net/sunrise918/article/details/5575054 In the past few days, I have thought about logical primary keys, business primary keys, and composite primary keys. I also searched for some discussions on the Internet. For more

Primary Key and foreign key in the database, primary key of the database

Primary Key and foreign key in the database, primary key of the database 1. What are primary keys and Foreign keys: A record in a relational database has several attributes. If one of the attribute groups (note that it is a group) uniquely

How to distinguish between primary key and foreign key _mssql in SQL databases

First, what is primary key, foreign key:A record in a relational database has several properties, and if one of the attribute groups (note the group) uniquely identifies a record, the attribute group can be a primary key such as: Student form

Introduction of primary key and foreign key in SQL database

First, what is the primary key, foreign key:There are several attributes in a record in a relational database, which can be a primary key if one of the attribute groups (note is a group) uniquely identifies a record:Student Table (School number,

[Database] About primary key and foreign key

This article is referenced from:http://blog.csdn.net/bingqingsuimeng/article/details/51595560First, what is the primary key, foreign key:There are several attributes in a record in a relational database, which can be a primary key if one of the

Hibernate primary key generation policy and hibernate primary key policy

Hibernate primary key generation policy and hibernate primary key policy Hibernate Primary Key Generation Policy 1. Automatic growth of identity Applicable to MySQL, DB2, and ms SQL Server. It uses the primary key generated by the database to

Primary Key design of databases

In our database design, the primary key of the database table is unavoidable. Many may not think deeply about it. The design of the primary key has a great impact on the design of the entire database, therefore, we have to pay attention to it.

Database system Basics Note (3)--primary key/foreign key index

This article reproduced from:http://www.cnblogs.com/longyi1234/archive/2010/03/24/1693738.html Blue Sky First, what is the primary key, foreign key relational database in a record in a number of attributes, ifAn attribute group (note is a group) can

Primary key and foreign key

first, what is primary key, foreign key:A record in a relational database has several properties, and if one of the attribute groups (one or more) can uniquely identify a record, the attribute group can be a primary key Like what Student form

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