pd的物理模型上展示的信息
PK - Primary Key
IX - Non-Unique Index
AK - Unique Index (AX should have been AK (Alternate Key))
CK - Check Constraint
DF - Default Constraint
FK - Foreign Key
UQ - Unique Constraint
博主強烈推薦：https://blog.csdn.net/persistencegoing/article/details/84376427
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