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drop foreign key

Author

Topic

eevans
Starting Member

48 Posts

Posted - 2009-02-20 : 09:03:52

Hello,

I created a foreign key using the following syntax:

ALTER TABLE alumni_master
FOREIGN KEY (user_def_id_2) REFERENCES name_master(id_num)

Now I want to drop that foreign key constraint but I can't seem to write an appropriate statement to do so.

Any suggestions?

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2009-02-20 : 09:25:42

just use ALTER TABLE alumni_master DROP CONSTRAINT . get constraint name from view as below:-


SELECT tc.CONSTRAINT_NAME
FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc
INNER JOIN INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE c
ON c.CONSTRAINT_NAME=tc.CONSTRAINT_NAME
WHERE c.COLUMN_NAME='user_def_id_2'
AND tc.TABLE_NAME='alumni_master'
AND tc.CONSTRAINT_TYPE='FOREIGN KEY'

then use it in

ALTER TABLE alumni_master DROP CONSTRAINT <name obtained from above>

eevans
Starting Member

48 Posts

Posted - 2009-02-20 : 09:30:11

Thanks! I never would have figured that out.

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2009-02-20 : 09:32:55

you're welcome

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