Ok, I think I might be overlooking something obvious/simple here... but I need to write a query that returns only records that match multiple criteria on the same column...<
Sometimes you can't see the wood for the trees :)
Your original SQL ..
SELECT contactid WHERE flag = 'Volunteer' AND flag = 'Uploaded'...
Should be:
SELECT contactid WHERE flag = 'Volunteer' OR flag = 'Uploaded'...