[support] Database : why the type fields are varchars

[melantias toomaate]

Hi,

We are going to build a web site using Drupal. I am new to Drupal CMS.
 While going through the drupal tables, i found that the 'type' field
in 'node_type' table is varchar. I am eager to know - why the type
fields are varchars instead of integers.
I would like to know this because varchars are slow in table joins and
searching. I believe there is a
specific reason in making the type fields - varchars.  Please let me know.

Thank you in advance,

Regards,
T.Melantias,
Programmer Analyst,
Olive Technology
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