检查此链接

http://www.w3schools.com/sql/sql_foreignkey.asp [ http://www.1keydata.com/sql/sql-foreign-key.html [ ^ ]

他们会帮助您

此链接也将指导您

^ ]

Check this link

http://www.w3schools.com/sql/sql_foreignkey.asp[^]

http://www.1keydata.com/sql/sql-foreign-key.html[^]

They will help you

This link too will guide you

http://blog.sqlauthority.com/2008/09/08/sql-server-%E2%80%93-2008-creating-primary-key-foreign-key-and-default-constraint/[^]

您需要告诉SQL外键引用哪个表:

You need to tell SQL which table the foreign key refers to:

EMP_ID int NOT NULL foreign key REFERENCES empDetails,

顺便说一句，将两个密钥声明为相同大小是个好主意-如果您显式地声明int(11)为一个密钥，则还应该使用int(11)作为外键，而不仅仅是int

BTW, the would be a good idea to declare both keys to be the same size - if you explicitly state int(11) for one, your should also use int(11) for the foreign key rather than just int

首先INT(11)无效，您不能在数据类型INT上指定列长.
创建表empDetails(
EMP_ID int主键NOT NULL，
密码varchar(10)NOT NULL
);


创建表LEAVE_DETAILS_ADMIN(
EMP_ID int NOT NULL外键引用empDetails(EMP_ID)，
LeaveEarnedCredit float(2)，
LeaveCasualCredit float(2)，
LeaveMaternityCredit float(2)
);


试试这个，Hop会很好用的.....

***的:-)

First of all INT(11) is INVALID, You can''t specify the column length on the data type INT..

CREATE TABLE empDetails (
EMP_ID int primary key NOT NULL,
password varchar(10) NOT NULL
);


CREATE TABLE LEAVE_DETAILS_ADMIN (
EMP_ID int NOT NULL foreign key references empDetails(EMP_ID) ,
leaveEarnedCredit float(2),
leaveCasualCredit float(2),
leaveMaternityCredit float(2)
);


try this, Hop will works fine,....

All the Best:-)