I have datasets of the same structure, and I know that I can query them like that, they are named by date:
SELECT column
FROM [xx.ga_sessions_20141019] ,[xx.ga_sessions_20141020],[xx.ga_sessions_20141021]
WHERE column = 'condition';
However, I really want to request different months of this data ... so instead of listing them all the same way as described above, there is a syntax that you can use that looks like this:
SELECT column
FROM [xx.ga_sessions_201410*] ,[xx.ga_sessions_201411*]
WHERE column = 'condition';
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