问题
In my table I have besides rest following fields
Email
UpperEmail
I should create trigger which will populate UpperEmail field with Email value transformed to upper letters. How to do this?
回答1:
Instead of having a separate column for UpperEmail, I would suggest that you create a computed column that does this. With a computed column, you would not need to use a trigger.
Ex:
Alter Table YourTableName Add UpperEmail As Upper(Email)
回答2:
As an alternative solution, have you thought about storing your e-mail addresses in a column with a case-insensitive collation? I ask because when I see someone caring about UPPER(value) or LOWER(value), it's so they can compare in a case-insensitive manner.
来源：https://stackoverflow.com/questions/14819871/create-trigger-after-insert