How to Drop Foreign Key Constraint

Question

0.00/5 (No votes)

See more:

SQL-Server-2008

Hi All,

Would anyone please tell me how to drop a foreign key constraint defined on column level in sql(or we can say having no name).

Code Example:

SQL

Create Table Employee
(
Employee_ID int Primary Key,
Job_ID int Foreign Key references JOB(Job_ID)  
)

/*consider there is another table Named "JOB" with column Job-ID*/

Posted 6-Jun-12 0:19am

Mahesh Kumar Badgujar

Updated 6-Jun-12 0:23am

Prasad_Kulkarni

v2

Add a Solution

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Agustee · Answer 1 · 2012-06-06T00:47:00

Solution 2

You can't drop the column because it depends on another column, but you can remove the key from the column. object explorer->expand your table->keys->right click->delete

Posted 6-Jun-12 0:47am

Agustee

devsuja · Answer 2 · 2012-06-06T01:22:00

hi,

CREATE TABLE [dbo].[t3](
[id] [int] NOT NULL,
[n_id] [int] NULL,
CONSTRAINT [PK_t3] PRIMARY KEY CLUSTERED
(
[id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

CREATE TABLE [dbo].[t3](
[id] [int] NOT NULL,
[n_id] [int] NULL,
CONSTRAINT [PK_t3] PRIMARY KEY CLUSTERED
(
[id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

ALTER TABLE [dbo].[t3] WITH CHECK ADD CONSTRAINT [FK_t3_t2] FOREIGN KEY([id])
REFERENCES [dbo].[t2] ([n_id])
GO

alter table drop constraint FK_t3_t2

snehaliteng · Answer 3 · 2012-06-06T00:32:00

Solution 1

alter table Employee drop Employee_Job_ID

Posted 6-Jun-12 0:32am

snehaliteng

Comments

Sandeep Mewara 6-Jun-12 6:36am

OP wanted to remove foreign key not delete the entire column and loose data!