If for existing content only, you can run a query to modify the database value for all current items, it's only a matter of looking at the database and identifying what is where and afterwards querying it to set the desired values.
I do agree to what CyberSEO says to some degree, if one doesn't know what to do, shit can hit the fan, but it's common sense that when you modify a database directly, you have the required knowledge to do so.
I'm not a huge fan of WordPress, i usually code my own shit, but from the rare occasions i did work with it, it has indeed the setup that where if one doesn't pay attention when dealing with the database, it can fuck everything up in no time.
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<developer> MechBunny  / KVS / PHP / MySQL / HTML5 / CSS3 / jQuery 
Email: vlad [at] faxite.com
Telegram: @dangerouscoding
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