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DECLARE @tagName NVARCHAR(255) = 'angularjs' -- TagName: Tag name of the question. DECLARE @beginDate DATETIME = '2016-01-01' DECLARE @endDate DATETIME = '2020-12-31' SELECT (DATEDIFF(SECOND,{d '1970-01-01'}, c.CreationDate)) - (DATEDIFF(SECOND,{d '1970-01-01'}, p.CreationDate)) as timeP from posts p left join posts c on (p.id = c.ParentId) join PostTags pt ON p.Id = pt.PostId join Tags t ON t.Id = pt.TagId WHERE (p.PostTypeId = 1) AND (t.TagName = @tagName) AND (p.CreationDate BETWEEN @beginDate AND @endDate)