How Do I Create A Foreign Key

Apr 27, 2007

I have a one to many relationship between two tables. The master table is keyed using an int ID field set to IsIdentity yes and this is the primary key. The field name is ChurchID. Likewise the detail table has such a field as it's primary key and is named ContactID.

 I carry the ChurchID field in the detail table and would like to make it the foreign key. I could not find this explained in the two books I have and the help was anything but that )perhaps it's just me afterall).

 Well, any help in this matter would be greatly appreciated as I find myself at a standstill until this can be resolved.

Thanks in advance.

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Why I Can Not Create The Foreign Key?

Jun 4, 2007

Hi, all experts here,

I encountered a very strange problem which not allowed me to create the foreign key between two tables. The column in one table I have set to be primary key, and it is existing in another table already. Therefore I am trying to create the foreign key for these two tables based on this coloum, but the database does not allow me to create this foreign key. The error message is always as: 'Alter table statement conflict with constraint 'foreign key_name', in table 'table_name', column 'table_key'). So why is that? And I am really looking forward to hearing from you shortly for your advices and help.



With best regards,

Yours sincerely,



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Can't Create A Foreign Key Using Non_primary Key Fields

Aug 9, 2004

Howdy all !
I'm just a bit on the frustrated side cause I want to create a foreign key but SQL Server won't let me. :(

I have table A with a primary key of main_id
I have table B with a primary key of another_id

Table A has a corresponding field called another_id.

I'm trying to create a foreign key between Table A & Table B on another_id but since it's not the Primary Key in Table A I get the following error:

There are no primary or candidate keys in the referenced table 'A' that match the referencing column list in the foreign key 'fk_classB_classA'.

Am I missing something totally obvious here? Why should I have to create a foreign key on a primary key?

What I find interesting is that I can create the relationship from enterprise manager but when I script it out is when I run into problems.

Here's the script I'm using:

Begin Code

alter table B add
constraint fk_classB_classA foreign key
(classB) references A (classB)
on delete no action
on update no action

End Code

Any help is greatly appreciated.

tam

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Feb 12, 2006

Hello.
Could anyone tell me why it is not possible to create a foreign key on two columns those references on 2 columns in another table? Those 2 columns have each a unique constraint.

I have:
CREATE TABLE T_PK (ID1 INT CONSTRAINT CHK_UNIQUE1 UNIQUE,ID2 INT CONSTRAINT CHK_UNIQUE2 UNIQUE)

CREATE TABLE T_FK (ID1 INT, ID2 INT)

And I want to do:

ALTER TABLE T_FK ADD CONSTRAINT CHK_FK FOREIGN KEY (ID1, ID2) REFERENCES T_PK (ID1,ID2)

I see no reason why this is not working because always
a row in the table T_FK referencing only one row in table T_PK.

Thank you.
Have a nice day.

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May 30, 2007

How do I create a table with a foreign key

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Jul 24, 2014

I am trying to create a FK using a composite PK and here are the details that I want to achieve.

Table -A
Column A1 not null,
Column A2 not null
Primary key (A1, A2).

Table -B
Column B1 Primary key.
Column B2 not null
FK (B2) References A(A1).

When I try to do this I am getting some errors. Questions: First of all is this possible? if yes, then how I can create it.

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Jul 3, 2015

why it is not possible to create a Foreign key to a Unique constraint?

Table A has column 1 holding a Primay key and two columns (2 and 3) holding a Unique combination (and some more columns).He created an Unique constraint on column 2 and 3 together.

He wanted to use this Unique combination to point to table B (instead of the table 1's PK) so he tried to create a foreign key on a column in table B but an error popped up prompting;

The columns in table 'TABLE_A' do not match an existing primary key or UNIQUE constraint.

Ok - these two columns ar no PK but the hold an Unique constraint......

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Alter Statement To Create Foreign Key Relationships

Jul 18, 2006

Here is the alter statement that I am trying to use to create a relationship between 2 tables. This does not seem to work on mobile. What am I doing wrong?


ALTER TABLE [SubCategory] CONSTRAINT [FK_SubCategory_Category] FOREIGN KEY([CategoryID])
REFERENCES [Category] ([CategoryID])
ON UPDATE CASCADE
ON DELETE CASCADE

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SQL 2012 :: Create Table With Both Keys As Foreign (error)

Dec 15, 2014

I'm trying to create a table in Microsoft Server Management Studio 2012. The table has two fields which are both foreign keys.

I created the following:

create table tblRoomEquipment(
RoomID nvarchar(8),
EquipmentType nvarchar(1),
foreign key (RoomID) references tblRoom(ID),
foreign key (EquipmentType) references tblEquipment(Type)
)

Both tblRoom and tblEquipment have the red line error which when I highlight say the they both reference an invalid table!

Both tables are there and have primary keys defined as ID & Type. I have searched around and all I could find was that there maybe a permission problem.

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Show Me Demo Of How To Create Foreign Key In SQL Server 2000

Dec 5, 2007



show me demo of how to create foreign key in SQL server 2000

thank you
maxs

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Jun 6, 2015

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Apr 6, 2007

Hi GuysOff late, I've grown with programming that requires more than a number of tables that has foreign keys with other tables' primary keys. It takes a really cumbersome coding to retrieve the code from another table with the other table having foreign keys. My question is, how do we program VS 2005 such that it does all the retrieval of the data from the database instead of us writing the code all by ourself?Is it really good database technique to bend the normalcy rules and have one to two columns having redundant data?Can anyone tell me how to write code that retrieves the foreign key data when the data from the other table is called?Thanks

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Jan 28, 2008

Hi all,

I use the following 3 sets of sql code in SQL Server Management Studio Express (SSMSE) to import the csv data/files to 3 dbo.Tables via CREATE TABLE & BUKL INSERT operations:

-- ImportCSVprojects.sql --

USE ChemDatabase

GO

CREATE TABLE Projects

(

ProjectID int,

ProjectName nvarchar(25),

LabName nvarchar(25)

);

BULK INSERT dbo.Projects

FROM 'c:myfileProjects.csv'

WITH

(

FIELDTERMINATOR = ',',

ROWTERMINATOR = ''

)

GO
=======================================
-- ImportCSVsamples.sql --

USE ChemDatabase

GO

CREATE TABLE Samples

(

SampleID int,

SampleName nvarchar(25),

Matrix nvarchar(25),

SampleType nvarchar(25),

ChemGroup nvarchar(25),

ProjectID int

);

BULK INSERT dbo.Samples

FROM 'c:myfileSamples.csv'

WITH

(

FIELDTERMINATOR = ',',

ROWTERMINATOR = ''

)

GO
=========================================
-- ImportCSVtestResult.sql --

USE ChemDatabase

GO

CREATE TABLE TestResults

(

AnalyteID int,

AnalyteName nvarchar(25),

Result decimal(9,3),

UnitForConc nvarchar(25),

SampleID int

);

BULK INSERT dbo.TestResults

FROM 'c:myfileLabTests.csv'

WITH

(

FIELDTERMINATOR = ',',

ROWTERMINATOR = ''

)

GO

========================================
The 3 csv files were successfully imported into the ChemDatabase of my SSMSE.

2 questions to ask:
(1) How can I designate the Primary and Foreign Keys to these 3 dbo Tables?
Should I do this "designate" thing after the 3 dbo Tables are done or during the "Importing" period?
(2) How can I set up the relationships among these 3 dbo Tables?

Please help and advise.

Thanks in advance,
Scott Chang

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as

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go

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go

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Regards,

Roel Alblas

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Sep 14, 1998

Hi!

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Toni

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I'm not sure where i'm going wrong.....

http://img.photobucket.com/albums/v294/Jertsy/Agh.jpg


there’s a pic of my tables.... There are 4 tables, blog, blogger, blog_entry, and comment.. Blog is only table without a FK.

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-------
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Table2
----------
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c1 number(10)

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