hello,
I was hoping someone might be able to help me with this problem... I have a table that is essentially joined back to a parent table. I have a column in the child table called "rank" that is a simple integer data type, used to indicate the order that the child elements should be displayed in. What I want to be able to do is make sure that at all times the child records linked to a parent record have values for the "rank" field that are consecutive starting at 1, ie (1,2,4,5,6) not (1,2,4,5,7). Can someone offer the best suggestion to do this? Should I write a PL/pgsql function and add it as a column constraint to check to make sure the numbers are consecutive? Can I use some kind of trigger that will execute a function and "automatically" give the fields the correct number? Would this seriously impact the performance since it would have to go through what might become a large table only to work on a small part of it (ie, records with the same parent_id)? I have a lot of experience with mySQL but a lot of these more sophisticated pgSQL features are a little tough for me to get a handle on immediately... thanks very much. -Cliff ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
