我只是想知道是否可以将表A中的表A复合主键用作外键。
CREATE TABLE A(
ID INT,
COD INT,
CONSTRAINT PK_INF PRIMARY KEY (ID, COD),
);
CREATE TABLE B(
REF_NUMBER INT,
NAME VARCHAR(30),
CONSTRAINT FK_INF FOREIGN KEY (REF_NUMBER) REFERENCES A(PK_INF) <- is this correct?
);
提前致谢。
答案 0 :(得分:1)
您的问题的答案是“是”,您可以使用复合主键进行外键引用。但是,你需要两列。像这样:
CREATE TABLE A(
ID INT,
COD INT,
CONSTRAINT PK_INF PRIMARY KEY (ID, COD),
);
CREATE TABLE B(
REF_ID INT,
REF_CODINT,
NAME VARCHAR(30),
CONSTRAINT FK_INF FOREIGN KEY (REF_ID, REF_COD) REFERENCES A(ID, COD) <- is this correct?
);