Showing posts with label opperation. Show all posts
Showing posts with label opperation. Show all posts

Monday, March 26, 2012

on update catch 22

How do you make an update cascade opperation if you want to set the PK to an excisting one?
I have a table where to post are the same only the PK differs, now I want to delete one but transfer it's dependecies. i.e redirect its references to the other post.
How can I do that using on update cascade/delete. I see a catch 22 coming up!

/Jonneponne

Hi

I would redirect all dependencies to a single post you want to keep and then delete a duplicate post.

ON UPDATE CASCADE works only if you are trying to update the KEY references by Foreign Key , not the other way round.

NB.