Help with SQL Query to turn off "Item available on Website"

Hi Guys,
We're working on launching our webstore. I have thousands of items that have the option "Item Available on Website" selected. Problem is that many of those products shouldn't be on the website.
I'd like to start fresh, and unselect the option from all the products. Can anyone help me out with the SQL Query to unselect that option from all my products in HQ and SO?
Any help will be greatly appreciated.
Thanks, Eric
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