Getting an error when created foreign key in one table using primary key of another table where single primary key created for two columns in one table

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SQL-Server-2008

I have created two tables one table having one primary key with two columns

create table PSM.dbo.conversion(Prospect_ID int,Customer_ID int ,Customer_Name varchar(50),Customer_Products_Services varchar(50),constraint pk1 primary key(Prospect_ID ,Customer_ID  ));

it run successfully

2nd table as foreign key of one column only

create table PSM.dbo.Customer_follow_up(Customer_ID int references conversion(Customer_ID),Customer_Name varchar(50),Customer_Products_Services varchar(50),Feedback nvarchar(1000));

here,getting an error

Msg 1776, Level 16, State 0, Line 1
There are no primary or candidate keys in the referenced table 'PSM.dbo.conversion' that match the referencing column list in the foreign key 'FK__Customer___Custo__5AEE82B9'.
Msg 1750, Level 16, State 0, Line 1
Could not create constraint. See previous errors.

Posted 5-May-11 19:32pm

shivani 2013

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Abhinav S · Answer 1 · 2011-05-05T19:37:00

Solution 1

When you add a foreign that does not exist as a primary key in the referenced table you will get this error.
Maybe this[^] can explain this better.

Posted 5-May-11 19:37pm

Abhinav S

mhwasim · Answer 2 · 2011-05-16T02:09:00

If Customer_ID will be a unique field then you can try this...I have put the UNIQUE constraint with Customer_ID field and FK will be created successfully....

SQL

create table dbo.conversion(Prospect_ID int,Customer_ID int UNIQUE ,Customer_Name varchar(50),Customer_Products_Services varchar(50),constraint pk1 primary key(Prospect_ID ,Customer_ID ));

create table dbo.Customer_follow_up(Customer_ID int references conversion(Customer_ID),Customer_Name varchar(50),
Customer_Products_Services varchar(50),Feedback nvarchar(1000));

Otherwise the reason mentioned in the Solution 1 will define it in detail..

Thanks