Question

I’ve done this before somewhere I’m sure of it!

I have a SQL Server 2000 table that I need to log changes to fields on updates and inserts into a second Logging table. A simplified version of the structure I’m using is below:

MainTable
ID varchar(10) PRIMARY KEY
DESCRIPTION varchar(50)

LogTable
OLDID varchar(10)
NEWID varchar(10)

For any other field something like this would work great:

Select i.DESCRIPTION As New, d.DESCRIPTION As Old 
From Inserted i
LEFT JOIN Deleted d On i.ID=d.ID

…But obviously the join would fail if ID was changed.

I cannot modify the Tables in way, the only power I have in this database is to create a trigger.

Alternatively is there someone who can teach me time travelling and I’ll go back into the past and ask myself back then how I did this? Cheers 🙂

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Edit:

I think I need to clarify a few things here. This is not actually my database, it is a pre-existing system that I have almost no control of, other than writing this trigger.

My question is how can I retrieve the old primary key if said primary key was changed. I don’t need to be told that I shouldn’t change the primary key or about chasing up foreign keys etc. That’s not my problem 🙂

Answer 1

Is it possible to assume that the INSERTED and DELETED tables presented to you in a trigger are guaranteed to be in the same order?