CODEWITHSUNDEEP
sqlsql-serverdatabaseforeign-keys
user3162932
user3162932

Reputation: 3039

The ALTER TABLE statement conflicted with the FOREIGN KEY constraint

Why does add a foreign key to the tblDomare table result in this error?

The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "FK__tblDomare__PersN__5F7E2DAC". The conflict occurred in database "almu0004", table "dbo.tblBana", column 'BanNR'.

Code

CREATE TABLE tblDomare
(PersNR VARCHAR (15) NOT NULL,
fNamn VARCHAR (15) NOT NULL,
eNamn VARCHAR (20) NOT NULL,
Erfarenhet VARCHAR (5),
PRIMARY KEY (PersNR));

INSERT INTO tblDomare (PersNR,fNamn,eNamn,Erfarenhet)
Values (6811034679,'Bengt','Carlberg',10);

INSERT INTO tblDomare (PersNR,fNamn,eNamn,Erfarenhet)
Values (7606091347,'Josefin','Backman',4);

INSERT INTO tblDomare (PersNR,fNamn,eNamn,Erfarenhet)
Values (8508284163,'Johanna','Backman',1);

CREATE TABLE tblBana
(BanNR VARCHAR (15) NOT NULL,
PRIMARY KEY (BanNR));

INSERT INTO tblBana (BanNR)
Values (1);

INSERT INTO tblBana (BanNR)
Values (2);

INSERT INTO tblBana (BanNR)
Values (3);

ALTER TABLE tblDomare
ADD FOREIGN KEY (PersNR)
REFERENCES tblBana(BanNR);

Upvotes: 302

Views: 446280

Answers (27)

Hashem Ahmed
Hashem Ahmed

Reputation: 111

This is a big problem. The only solution I found was to delete all the data from the table, but if you have a product, this solution is not good.

I tried to create a new table without making any relations between the tables. After that, I tried to create the relations, and it worked!

Upvotes: 1

MURAT BOLULU
MURAT BOLULU

Reputation: 114

You're referencing it with a key that doesn't exist in the underlying table. This gives an error due to existing records inside. (because the content of the relationship is empty when you first create it)

You can either assign a value as default (my recommendation if there is data in the secondary table) or re-create the table you are referring to.

Upvotes: 1

Ralph B. Roman
Ralph B. Roman

Reputation: 371

In very simple words your table already has data present in it and the table you are trying to create relationship with does have that Primary key set for the values that are already present.

  1. Either delete all the values of the existing table.
  2. Add all the values of foreign key reference in the new table.

Upvotes: 14

RainyTears
RainyTears

Reputation: 189

Please try below query:

CREATE TABLE tblBana
(BanNR VARCHAR (15) NOT NULL PRIMARY KEY,

);

CREATE TABLE tblDomare
(PersNR VARCHAR (15) NOT NULL PRIMARY KEY,
fNamn VARCHAR (15) NOT NULL,
eNamn VARCHAR (20) NOT NULL,
Erfarenhet VARCHAR (5),
FK_tblBana_Id VARCHAR (15) references  tblBana (BanNR)
);


INSERT INTO tblBana (BanNR)
Values (3);


INSERT INTO tblDomare (PersNR,fNamn,eNamn,Erfarenhet,FK_tblBana_Id)
Values (8508284173,'Johanna','Backman',1,3);

Upvotes: 0

Smutje
Smutje

Reputation: 18173

It occurred because you tried to create a foreign key from tblDomare.PersNR to tblBana.BanNR but/and the values in tblDomare.PersNR didn't match with any of the values in tblBana.BanNR. You cannot create a relation which violates referential integrity.

Upvotes: 508

max
max

Reputation: 279

Remove all existing data from your tables and then make a relation between the tables.

Upvotes: 27

Amara Miloudi
Amara Miloudi

Reputation: 140

When you alter table column from nullable to not nullable column where this column is foreign key, you must :

  1. Firstly, initialize this column with value (because it is foreign key not nullable).

  2. After that you can alter your table column normally.

Upvotes: 0

VJPPaz
VJPPaz

Reputation: 1015

From our end, this is the scenario:

  1. We have an existing table in the database with records.
  2. Then I introduces a NOT nullable foreign key
  3. After executing the update i got this error.

How did i solve you ask?

SOLUTION: I just removed all the records of the table, then tried to update the database and it was successful.

Upvotes: 3

ListenSoftware Louise Ai Agent
ListenSoftware Louise Ai Agent

Reputation: 4253

A foreign key constraint in a child table must have a parent table with a primary key. The primary key must be unique. The foreign key value must match a value in the patent table primary key

Upvotes: 0

Ahmed Hafiz
Ahmed Hafiz

Reputation: 67

I had the same problem. My issue was having nullable: true in column (migration file):

AddColumn("dbo.table", "column", c => c.Int(nullable: true));

Possible Solutions:

  1. Change nullable 'false' to 'true'. (Not Recommended)
  2. Change property type from int to int? (Recommended)

And if required, change this later after adding column > then missing field data in previous records

If you've changed an existing property from nullable to non-nullable:
3) Fill the column data in database records

Upvotes: 1

Christian Møller
Christian Møller

Reputation: 1

or you can use this

SELECT  fk_id FROM dbo.tableA
Except
SELECT fk_id From dbo.tableB

Upvotes: -1

belka
belka

Reputation: 1540

When you define a Foreign Key in table B referencing the Primary Key of table A it means that when a value is in B, it must be in A. This is to prevent unconsistent modifications to the tables.

In your example, your tables contain:

tblDomare with PRIMARY KEY (PersNR):

PersNR     |fNamn     |eNamn      |Erfarenhet
-----------|----------|-----------|----------
6811034679 |'Bengt'   |'Carlberg' |10
7606091347 |'Josefin' |'Backman'  |4
8508284163 |'Johanna' |'Backman'  |1
---------------------------------------------

tblBana:

BanNR
-----
1
2
3
-----

This statement:

ALTER TABLE tblDomare
ADD FOREIGN KEY (PersNR)
REFERENCES tblBana(BanNR);

says that any line in tblDomare with key PersNR must have a correspondence in table tblBana on key BanNR. Your error is because you have lines inserted in tblDomare with no correspondence in tblBana.

2 solutions to fix your issue:

  • either add lines in tblBana with BanNR in (6811034679, 7606091347, 8508284163)
  • or remove all lines in tblDomare that have no correspondence in tblBana (but your table would be empty)

General advice: you should have the Foreign Key constraint before populating the tables. Foreign keys are here to prevent the user of the table from filling the tables with inconsistencies.

Upvotes: 8

M Arslan Riaz
M Arslan Riaz

Reputation: 128

Please first delete data from that table and then run the migration again. You will get success

Upvotes: 2

Metin Atalay
Metin Atalay

Reputation: 1517

I encounter some issue in my project.

enter image description here

In child table, there isn't any record Id equals 1 and 11

mage

I inserted DEAL_ITEM_THIRD_PARTY_PO table which Id equals 1 and 11 then I can create FK

Upvotes: 2

jeromej
jeromej

Reputation: 11626

In my scenario, using EF, upon trying to create this new Foreign Key on existing data, I was wrongly trying to populate the data (make the links) AFTER creating the foreign key.

The fix is to populate your data before creating the foreign key since it checks all of them to see if the links are indeed valid. So it couldn't possibly work if you haven't populated it yet.

Upvotes: 2

greg
greg

Reputation: 1873

Smutje is correct and Chad HedgeCock offered a great layman's example. Id like to build on Chad's example by offering a way to find/delete those records. We will use Customer as the Parent and Order as the child. CustomerId is the common field. 

select * from Order Child 
left join Customer Parent on Child.CustomerId = Parent.CustomerId
where Parent.CustomerId is null

if you are reading this thread... you will get results. These are orphaned children. select * from Order Child left join Customer Parent on Child.CustomerId = Parent.CustomerId where Parent.CustomerId is null Note the row count in the bottom right.

Go verify w/ whomever you need to that you are going to delete these rows!

begin tran 
delete Order
from Order Child 
left join Customer Parent on Child.CustomerId = Parent.CustomerId
where Parent.CustomerId is null

Run the first bit. Check that row count = what you expected

commit the tran 

commit tran

Be careful. Someone's sloppy programming got you into this mess. Make sure you understand the why before you delete the orphans. Maybe the parent needs to be restored.

Upvotes: 3

PatsonLeaner
PatsonLeaner

Reputation: 1250

Try this solution:

There is a data item in your table whose associated value doesn't exist in the table you want to use it as a primary key table. Make your table empty or add the associated value to the second table.

Upvotes: 60

adrianex03
adrianex03

Reputation: 83

You should see if your tables has any data on the rows. If "yes" then you should truncate the table(s) or else you can make them to have the same number of data at tblDomare.PersNR to tblBana.BanNR and vise-verse.

Upvotes: 2

Thinker Bell
Thinker Bell

Reputation: 97

Try DELETE the current datas from tblDomare.PersNR . Because the values in tblDomare.PersNR didn't match with any of the values in tblBana.BanNR.

Upvotes: 8

Willy David Jr
Willy David Jr

Reputation: 9151

This happens to me, since I am designing my database, I notice that I change my seed on my main table, now the relational table has no foreign key on the main table.

So I need to truncate both tables, and it now works!

Upvotes: 2

Ankita Biswas
Ankita Biswas

Reputation: 443

It is possible to create the foreign key using ALTER TABLE tablename WITH NOCHECK ..., which will allow data that violates the foreign key.

"ALTER TABLE tablename WITH NOCHECK ..." option to add the FK -- This solution worked for me.

Upvotes: 33

Doug Boude
Doug Boude

Reputation: 27

and just FYI, in case you do all of your data reference checks and find no bad data...apparently it is not possible to create a foreign key constraint between two tables and fields where those fields are the primary key in both tables! Do not ask me how I know this.

Upvotes: -3

khadar
khadar

Reputation: 31

the data you have entered a table(tbldomare) aren't match a data you have assigned primary key table. write between tbldomare and add this word (with nocheck) then execute your code.

for example you entered a table tbldomar this data

INSERT INTO tblDomare (PersNR,fNamn,eNamn,Erfarenhet)
Values (6811034679,'Bengt','Carlberg',10);

and you assigned a foreign key table to accept only 1,2,3.

you have two solutions one is delete the data you have entered a table then execute the code. another is write this word (with nocheck) put it between your table name and add like this

ALTER TABLE  tblDomare with nocheck
ADD FOREIGN KEY (PersNR)
REFERENCES tblBana(BanNR);

Upvotes: 3

dantey89
dantey89

Reputation: 2287

This query was very useful for me. It shows all values that don't have any matches

select FK_column from FK_table
WHERE FK_column NOT IN
(SELECT PK_column from PK_table)

Upvotes: 101

GirishBabuC
GirishBabuC

Reputation: 1379

Before You add Foreign key to the table, do the following

  1. Make sure the table must empty or The column data should match.
  2. Make sure it is not null.

  3. If the table contains do not go to design and change, do it manually.

    alter table Table 1 add foreign key (Column Name) references Table 2 (Column Name)

    alter table Table 1 alter column Column Name attribute not null

Upvotes: 15

ako
ako

Reputation: 179

i had this error too as Smutje reffered make sure that you have not a value in foreign key column of your base foreign key table that is not in your reference table i.e(every value in your base foreign key table(value of a column that is foreign key) must also be in your reference table column) its good to empty your base foreign key table first then set foreign keys

Upvotes: 3

sam05
sam05

Reputation: 199

I guess, a column value in a foreign key table should match with the column value of the primary key table. If we are trying to create a foreign key constraint between two tables where the value inside one column(going to be the foreign key) is different from the column value of the primary key table then it will throw the message.

So it is always recommended to insert only those values in the Foreign key column which are present in the Primary key table column.

For ex. If the Primary table column has values 1, 2, 3 and in Foreign key column the values inserted are different, then the query would not be executed as it expects the values to be between 1 & 3.

Upvotes: 14

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