On Tuesday 29 June 2004 07:19 pm, Phil Endecott wrote: > Kenneth Gonsalves <[EMAIL PROTECTED]> wrote: > > in my app i have a table where the id serves as a foreign key for > > one or more other tables. if i want to delete a row in the table, > > i currently search the other tables where this table is referenced > > to see if the row is in use - and then, if not in use, permit > > deletion.
> > Now if i want the delete button in my app to be disabled whenever > > a row that is in use is selected, searching the database every time > > would dramatically slow down the app. > > Basically you do have to do this search. But it won't be too slow if you > create an index on the foreign key. pity. thought postgres would have some function like 'in_use' to tell when a row that is used as a foreign key is in actual use and hence cannot be deleted. surely, in a database of millions of records, it wouldnt have search them all to find if the row is in use? in my case the id field serves as a foreign key in several tables -- regards kg http://www.onlineindianhotels.net - hotel bookings reservations in over 4600 hotels in India http://www.ootygolfclub.org ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html
