1.  major key
2.  principal linkage

• 1. 主键: primary key | private String cid | key | private Long id
• 2. 主键约束: PRIMARY KEY | primary key constraint | PK
• 3. 复合主键: Composite Primary Key | composite-id | Composite Key | composite PK

更多释义

• 1.自动生成主键和未知的主键。
  Automatic primary key and unknown primary key generation.
  dict.yoduao.com
• 2.确保每个表都有一个主键。
  Make sure each table has a primary key.
  dict.yoduao.com
• 3.可以调整主键的生成策略，甚至指定复合主键。
  You can adjust the primary-key creation strategy or even specify a composite primary key.
  dict.yoduao.com

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