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So, there's an idea I had ...

Tags that are very old and have a low number of questions, are probably not really useful.

... which made me want to write a query for checking them out.

Wait, what... There's no field to access the creation date of the tag!

Can the tag creation date be added to the Data Explorer and to the SE API?

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Why don't you just look up the creation date of the earliest post associated with that tag? –  Bryan Dunsmore Aug 25 '12 at 23:43
    
@BryanDunsmore It might've been removed from an earlier post, or added to that old post much later –  Michael Mrozek Aug 26 '12 at 2:56
    
@MichaelMrozek What I would do then is to go through the suggested edits and see if any of them has an earlier date where the tags are edited. –  Bryan Dunsmore Aug 26 '12 at 3:31
    
@BryanDunsmore: It would spare a lot of work if we just had a field instead of having to do a double join... –  Tom Wijsman Aug 26 '12 at 11:23
    
@BryanDunsmore You'd need to find the earliest tag creation or tag edit that contains the tag, rather. But this only works if the post hasn't been deleted. –  Gilles Aug 26 '12 at 11:49
    

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