[英]SQL Server: adding foreign key on multiple columns
I'm trying to create a foreign key on two columns of a table to point to the same column of another table, but I seem to get an error. 我正在尝试在表的两列上创建一个外键以指向另一个表的同一列,但我似乎得到一个错误。
I'm using SQL Server with Microsoft SQL Server Management Studio. 我正在使用SQL Server和Microsoft SQL Server Management Studio。
Here's what I do: 这是我做的:
CREATE TABLE House
(
hid INTEGER PRIMARY KEY,
hname VARCHAR(32) NOT NULL,
address VARCHAR(128) NOT NULL,
);
CREATE TABLE Room
(
sid INTEGER,
hid INTEGER FOREIGN KEY REFERENCES House(hid),
rname VARCHAR(32) NOT NULL,
CONSTRAINT sid_pk PRIMARY KEY(sid, hid)
);
CREATE TABLE Seat
(
hid INTEGER,
sid INTEGER,
plid INTEGER,
row INTEGER NOT NULL,
seat INTEGER NOT NULL,
CONSTRAINT sid_fk
FOREIGN KEY (hid, sid) REFERENCES Room(hid, sid), <-- Here's the error
CONSTRAINT plid_pk
PRIMARY KEY (hid, sid, plid),
UNIQUE(hid, sid, row, seat)
);
And I keep getting "Error 1776" saying that there is no primary key in the room-table... 我一直得到“错误1776”说房间表中没有主键......
as per comments from @hogan..posting as community wiki,so that this is not lost 根据来自@ hogan的帖子,将其作为社区维基,这样就不会丢失
In the Room
table ,primary key is (sid, hid)
..But in seat
table,you are referencing a new primary key Room(hid, sid)
在
Room
表中,主键是(sid, hid)
..但是在seat
表中,您正在引用一个新的主键Room(hid, sid)
so change your room
table constraint definition like below 所以改变你的
room
表约束定义,如下所示
CONSTRAINT sid_fk FOREIGN KEY (hid, sid) REFERENCES Room(sid,hid)
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