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Q&A for students, teachers, polyglots, and anyone interested in the techniques of second-language acquisition

select h.hours as [Hour], count(postsCounter) as [Posts], count(commentsCounter) as [Comments], count(suggestedCounter) as [Suggested Edits], count(editsCounter) as [Edits], count(counter) as [Total Activity]
from
(
select datepart(hour, creationdate) as active, 1 as counter, 1 as postsCounter, NULL as commentsCounter, NULL as editsCounter, NULL as suggestedCounter from posts
union all
select datepart(hour, creationdate) as active, 1 as counter, NULL as postsCounter, 1 as commentsCounter, NULL as editsCounter, NULL as suggestedCounter from comments
union all
select datepart(hour, creationdate) as active, 1 as counter, NULL as postsCounter, NULL as commentsCounter, NULL as editsCounter, 1 as suggestedCounter from suggestededits
union all
select datepart(hour, creationdate) as active, 1 as counter, NULL as postsCounter, NULL as commentsCounter, 1 as editsCounter, NULL as suggestedCounter from posthistory
) as a
right join
(
select distinct datepart(hour, CreationDate) as hours from posts
) as h on a.active = h.hours

group by h.hours
order by h.hours

fork query

created jan 24 14 anonymous