Hi there

I am trying to convert a SQL Anywhere database to postgres. Within SQL anywhere 
a field can have a default value of 'last user'. This means that when you 
perform an update on a table, if the field is not explicitly set then the 
current user is used. So for instance if I have a field called mod_user in a 
table, but when I do an update on the table and do not set mod_user then SQL 
Anywhere sets the field to current_uer. I have tried to replicate this using a 
postgres trigger in the before update. However, if I do not set the value then 
it automatically picks up the value that was already in the field. Is there a 
way to tell the difference between me setting the value to the same as the 
previous value and postgres automatically picking it up.

If the field myfield contains the word 'me'. Can I tell the difference between:
Update table1 set field1='something',myfield='me'
And
Update table1 set field1='something'


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