Defaults can only be constants.
You might want to look at timestamp.
The first timestamp field in a row gets updated every time teh record
changes.
All other timestamps in a row only get updated automatically on insert.
Jamie S Buchanan wrote:
>
> Hello all,
> I'm a third year uni student in Scotland doing a year long project which
> involves a fair amount of MySQL. I have the following problem and would be
> appreciative if I could get some advice on solving it:
>
> - in the script I run to create a table how do I code one DateTime field
> to intially be set to a value of another DateTime field?
>
> More specifically, I have two DateTime fields (A and B), in my creation
> script I want to set the default value of B to the value of A so that
> when I write a new record to the table the position of B can be left
> NULL, or equivalent, but the value of A will be stored in it's place. I
> later on want to change B independently to a different value than A so I
> don't want a strict contraint that they must always be the same.
>
> Thanks,
> Jamie.
>
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