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varchar to text

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Hello.
 
There are some columns in my tables that I should change from varchar to text, in order to have enough space for long textual commentaries.
Before I do that, I would like to know is there any restriction regarding text type in comparison to varchar type?
Especially concerning triggers and rules ?
Namely, I have triggers that perform audit trail of all my tables, so I'm concerned whether it will work for text type fields ?
 
One additional question is regarding my MS Access front-end. Would it be a problem for Access ?
 
Thanks in advance,
 
Zlatko

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