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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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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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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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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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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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
I want to create a table with primary key , and put relationship with second table.
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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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Sep 13, 2006
Ok, I'm really new at this, but I am looking for a way to automatically insert new records into tables. I have one primary table with a primary key id that is automatically generated on insert and 3 other tables that have foreign keys pointing to the primary key. Is there a way to automatically create new records in the foreign tables that will have the new id? Would this be a job for a trigger, stored procedure? I admit I haven't studied up on those yet--I am learning things as I need them. Thanks.
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Aug 4, 2004
Hi All,
I'm trying to create a proc for granting permission for developer, but I tried many times, still couldn't get successful, someone can help me? The original statement is:
Create PROC dbo.GrantPermission
@user1 varchar(50)
as
Grant create table to @user1
go
Grant create view to @user1
go
Grant create Procedure to @user1
Go
Thanks Guys.
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May 20, 2008
the subject pretty much says it all, I want to be able to do the following in in VB.net code):
{[If [table with this name] already exists [in this sql database] then [ don't create another one] else [create it and populate it with these values]}
How would I do this?
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Mar 3, 2014
I created a cursor that moves through a table to retrieve a user's name.When I open this cursor, I create a variable to store the fetched name to use within the BEGIN/END statements to create a login, user, and role.
I'm getting an 'incorrect syntax' error at the variable. For example ..
CREATE LOGIN @NAME WITH PASSWORD 'password'
I've done a bit of research online and found that you cannot use variables to create logins and the like. One person suggested a stored procedure or dynamic SQL, whereas another pointed out that you shouldn't use a stored procedure and dynamic SQL is best.
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Jul 20, 2005
Can I dynamically (from a stored procedure) generatea create table script of all tables in a given database (with defaults etc)a create view script of all viewsa create function script of all functionsa create index script of all indexes.(The result will be 4 scripts)Arno de Jong,The Netherlands.
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Dec 27, 2003
Hello,
I want to make a poll and have to use a foreign key in my database. This is not possible in Web Matrix so I have to use SQL Enterprise Manager. But don't know how. I read the help but can't figure it out. Can someone help me??? Thanks in advance.
Regards,
Roel Alblas
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Sep 14, 1998
Hi!
Is it possible in SQL 6.5 to create a Foreign Key on a field that
has a datatype of SMALLINT? I have created FK`s with
other datatypes, but it doesn`t seem to work with this particular
datatype. Is there some trick to this?
Thank you for your assistance!
Toni
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Mar 30, 2006
When you set a foreign key to reference a primary key on another table, does the foreign key automatically update? Can anyone explain just how to make a relational table from just the nuts and bolts SQL statements.
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Dec 20, 2004
Hi there,
I'm trying to make a few tables in SQL (First time user). The tables have been derived from a logical model based around my assignment...
I'm having problem getting two foreign keys in one table in the SQL. I keep getting the duplicate foreign key error...
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.
have a look & thanks for any and all help....
Spencer.
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Jun 23, 2007
Hi Friends,Is there any way to get the table name which is referenced by theforeign keyfor example: consider two table "Staff" and "Department"Staff with following columnsPK_IDFK_DepartmentIDNameAddressDepartment with following columnsPK_DepartmentIDDeptNameActually what i need is: Initially i would be having the table name as"Staff"from Staff table i need to identify that the column FK_DepartmentID isa foreign keyand the primary key is in the Department tablei need to traverse from Staff table and identify that FK_DepartmentIDis a primary key in Department tablethis has to be accomplished by sql query.... probably this could befetched fromData Dictionary but i couldnt find the relationship between the systemtables.ThanksArunDhaJ
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Jun 5, 2007
I would like to create a foreign key but the Primary table has 2 fields as it Primary Key. Is there a way to create a Foreign Key that links only on one field of the primary key.
Ex: table 1: id int , language char(2), description varchar(100) PK = ID + language
table 2 : id int, idlanguage int PK = id FK (idLanguage refers to id from table 1)
This cause an error because the foreign key does not include all part of the primary key.
Rufen
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Jan 4, 2008
table1
-------
a1 number(10) PK
b1 varchar2(3)
c1 number(10)
Table2
----------
d1 number(10) PK
b1 varchar2(3)
c1 number(10)
Can I make a Foreign key from Table2(b1,c1) to table1(b1,c1) if b1 in table1 might be null.
When I tried that I got this.
ORA-02270: no matching unique or primary key for this column-list
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Apr 13, 2008
Hi everyone,
My main table has a column named "customer" which is a foreign key pointed to my secondary table consisted of a column "customer_id".
I wanted to change my secondary table's customer_id's name into another name whereby deleting it and create a new column instead (i dont know another way of changing names by code) but i'm not allowed to do that due to "customer_is"'s being attached to my main table as FK.
Any suggestion how to do it ?
Thanks a lot.
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Aug 10, 2007
i want to make primary key and foreign key relationship of table A1 and table B1 but A1 exist in database A and B1 exist in database B
column name u can pretain as C1, C2
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Jul 20, 2005
I have some code that dynamically creates a database (name is @FullName) andthen creates a table within that database. Is it possible to wrap thesethings into a transaction such that if any one of the following fails, thedatabase "creation" is rolledback. Otherwise, I would try deleting on errordetection, but it could get messy.IF @Error = 0BEGINSET @ExecString = 'CREATE DATABASE ' + @FullNameEXEC sp_executesql @ExecStringSET @Error = @@ErrorENDIF @Error = 0BEGINSET @ExecString = 'CREATE TABLE ' + @FullName + '.[dbo].[Image] ( [ID][int] IDENTITY (1, 1) NOT NULL, [Blob] [image] NULL , [DateAdded] [datetime]NULL ) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]'EXEC sp_executesql @ExecStringSET @Error = @@ErrorENDIF @Error = 0BEGINSET @ExecString = 'ALTER TABLE ' + @FullName + '.[dbo].[Image] WITHNOCHECK ADD CONSTRAINT [PK_Image] PRIMARY KEY CLUSTERED ( [ID] ) ON[PRIMARY]'EXEC sp_executesql @ExecStringSET @Error = @@ErrorEND
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Mar 26, 2008
I'm new to using SSIS and have been reading and learning slowly how to use it. I'm trying to create an identical copy of our database for reporting. I've used the Import/Export wizard, but have had some issues with foreign keys and with sql_variant columns.
I've tried searching for anything but haven't had any luck as of yet. I guess I don't even know where to start or what to look for.
Any help would be appreciated. Thanks!
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Aug 8, 2006
I am deleting a column from a table in code. Before I drop the colum I need to find if the column belongs to a foreign key. I have the names of the foreign keys for the table from sysobjects.How can I determine what columns are part of the foreign key?
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Oct 5, 2006
Just installed this the Forum starter Kit and am getting this message when I try to add the first threadI'm a bit of a newbie but not only damp behind the earsThe INSERT statement conflicted with the FOREIGN KEY constraint "FK_MembersForums_MemberInfo". The conflict occurred in database "SQL2005_****_*****01", table "dbo.MemberInfo", column 'memberid'.The statement has been terminated. What do I need to do to the SQL Tables in order to get this to work?
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Nov 9, 2006
Hi, i have 3 tables.
Orders: {OrderNr(PK, autonumber), date}
Order_Line: {OrderNr(FK), ItemNr(FK), number}
Items: {ItemNr(PK), Name, ...}
How do I insert a new Order with a new order_line? I get this error: The INSERT statement conflicted with the FOREIGN KEY constraint
I can't figure out how to capture the autogenerated OrderNr.
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Apr 17, 2007
Can any body tell me how to know to what columns of other table it refers to.
shiva kumar
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