[thelist] Free Tip about SQL

Sarah poohbear at designshift.com
Fri Jul 18 14:55:47 CDT 2003

>>I usually do something like:
>>FROM users
>>WHERE username = 'chris'
>>         AND coolfactor = 'infinite'
>>         AND babemagnet = 'yes';
>>(we are assuming that) chris, infinite, and yes all came from
>>information that was passed to a form on a website.
>Actually, this isn't guaranteed to work at all, simply because you're 
>assuming that your record is unique. In a talbe with a large number of 
>fields, you really don't want to be doing a where clause on every field. 
>(Sure as hell on on large text or binary fields, performance will drop 
>like shares in Enron.)
>Stick to whatever mechanism your DB provides. It might not be as 100% 
>portable, but it is guaranteed to work every time, which all of these 
>other methods are not.

I usually do something similar to Chris's example, but I would use MAX(id) 
in case their is a duplicate record in the database already.


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