Raphael,
> I need to put a field in a database that will hold a login for the
> users.
> That login is rather long (it's their e-mail address) and of variable
> length (I can't
> change that :-).
> I thought of using the text type, but wondered what were the
> implications in terms of
> speed and amount of data (does it use much more space than other
> character types?)
Not in PostgreSQL. However, you may find that some interfaces (such as
ODBC and JDBC) put limits on waht you can do with a Text column. For
example, MS Access/ODBC will interpret a TEXT field (or and VARCHAR
over 250 chars) as a "memo" field and refuse to let you search or
aggregate on the field.
Otherwise, TEXT and VARCHAR perform the same in PostgreSQL.
-Josh Berkus
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