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He meant that if you use a SQL backend to your page, be VERY careful as people can and probably will delete stuff. Generally it's a huge security issue with a database. Speaking of which, I need to try that at home on my pages.
If you use a PHP/SQL combo, you'll need to write a function that'll scan the users input into the page so that it doesn't contain any important things like ', ", ;, DROP, DELETE and a bunch of others.
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