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basically, I have a cookie with the category slug stored, using this data I want to query the database and return the ID of the category.

I am new to mysql and this seems like an advanced query that may need to use joins, any help or guidance would be much appreciated.

Thank you!

Reference: http://codex.wordpress.org/File:WP3.0-ERD.png

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Instead of writing custom SQL, you should be able to just use the native get_category_by_slug() which will return a full category object to include the category ID.

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It is in a file completely separate from wordpress. – Mr D May 19 '12 at 2:50
    
What is in a file completely separate from wordpress? – mor7ifer May 19 '12 at 10:58

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