Scott Marlowe wrote:
Charles Mortell wrote:
Using PG 8.0 on Windows, I have a table 'business_list' with a two column
primary key. It's a linking table and it's primary keys are the keys from
the two tables I am linking: item_id and business.
Should I be able to update one of those primary key fields?
Really it's a mistake to update a primary key. A primary key by definition
identifies the row; changing it means to delete the row and insert a new one.
Updates are for when you've identified a specific row, that is, a specific
primary key. That means that updates are only for dependent columns.
What you want to do is literally remove the old record and insert a new one.
The duplicate key violation is the purpose of having a primary key, after all.
Otherwise you'd create two rows where you should only have one.
--
Lew
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