我对表创建有疑问。我想将“Ono”和“Pno”的属性组合成新表的主键。这些都是外键,每个都来自不同的表。我只使用CONSTRAINT Ono_Pno_PK PRIMARY KEY(Ono,Pno)吗?
到目前为止我用过的东西:
CREATE TABLE ODetails
(
Ono Number Not Null,
Pno Number Not Null,
Qty Number(3) Not Null,
Creation_Date Date Not Null,
Created_By VARCHAR(10) Not Null,
Last_Update_Date Date Not Null,
Last_Updated_By VARCHAR2(10) Not Null,
CONSTRAINT Ono_FK FOREIGN KEY (Ono) REFERENCES Orders (Ono),
CONSTRAINT Pno_FK FOREIGN KEY (Pno) REFERENCES Parts (Pno)
);
答案 0 :(得分:6)
只需在约束后添加此行,
CONSTRAINT tb_PK PRIMARY KEY (Ono, Pno)