It is common for relational databases to use the concept of primary keys, generated by an auto-increment feature or by a sequence generator.
在关系数据库中通常可以使用主键，它由一个自动递增特性或序列生成器生成。
Problem 2: Not using auto-increment functionality
问题 2：不使用自动增量功能
The ID is set to auto-increment and is used as the primary key.
ID 被设置为自动增量并作为主键。
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