OrderNumber int NOT NULL, PersonID int FOREIGN KEY REFERENCES Persons(PersonID));```要允许对 `FOREIGN KEY` 约束进行命名,并在多列上定义 `FOREIGN KEY` 约束,请使用以下 SQL 语法:### 对于 MySQL / SQL Server / Oracle / MS Access:```sqlCREATE TABLE Orders ( OrderID int NOT NULL, OrderNumber int NOT NULL, PersonID int, PRIMARY KEY (OrderID), CONSTRAINT FK_PersonOrder...