MySQL "NULL" questions

Posted by Camran on Stack Overflow See other posts from Stack Overflow or by Camran
Published on 2010-02-07T09:13:46Z Indexed on 2010/03/14 9:45 UTC
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php

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mysql

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sql

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database

I have a table with several columns.

Sometimes some of these column fields may be empty (ie. I won't use them in some cases).

My questions:

Would it be smart to set them to NULL in phpmyadmin?
What does the "NULL" property actually do?
Would I gain anything at all by setting them to NULL?
Is it possible to use a NULL field the same way even though it is set to null?

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