Used to query StackOverflow's data explorer. Originally written by Guillermo Winkler. Adapted by me

queryLang.sql

SELECT
         Questions.CreationDate, 
         Questions.Title, 
         Tags.TagName,
         Answers.CreationDate as ResponseDate,
         datediff(minute, Questions.CreationDate, 
                          Answers.CreationDate) as ResponseTime,
         cast(DATEPART(hour, Questions.CreationDate) as int) as ResponseHour
    FROM Posts Questions
    join Posts Answers on Answers.id = Questions.AcceptedAnswerId
                         and datediff(hour, Questions.CreationDate, Answers.CreationDate) < 5
    join PostTags ON PostTags.PostId = Questions.Id
    join Tags on Tags.Id = PostTags.TagId
    WHERE Questions.CreationDate > convert(datetime, '01/01/2012', 101)  
          and TagName in ('c#', 'java', 'php', 'javascript', 'c++', 'python', 'objective-c', 'c', 'ruby', 'vb.net')