Harald Fuchs wrote:
In article <[EMAIL PROTECTED]>,
Daniel Kasak <[EMAIL PROTECTED]> writes:
Bryan Cantwell wrote:
Trying to migrate to MySql 5 from Sybase asa. I have a tables that
have column values that are calculated based on other columns in the
table. How can I accomplish the same in MySql?
This sounds a job for a trigger - an insert trigger.
I haven't used triggers in mysql, so I can't help you with exactly how
to do it.
If SELECT performance is good enough, a VIEW would probably be easier.
The advantage of a trigger is that it only runs when the data is
inserted ( and possibly updated ). Depending on the use of the database,
you may have a situation where the data is inserted and then selected
from multiple times - that's at least the usage pattern we have here. In
this case, you're better off with a stored procedure.
Also keep in mind that the title of the post said 'default', indicating
that the fields in question might take on a different value to the
calculated one.
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Daniel Kasak
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NUS Consulting Group
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North Sydney, NSW, Australia 2060
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