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select
case when datepart(year,eventdate) like '17%' then '18th century'
when datepart(year,eventdate) like '18%' then '19th century'
when datepart(year,eventdate) like '19%' then '20th century'
else '21th century'
end as century, count(eventid) as [Number of Events] from tblEvent group by
cube( case when datepart(year,eventdate) like '17%' then '18th century'
when datepart(year,eventdate) like '18%' then '19th century'
when datepart(year,eventdate) like '19%' then '20th century'
else '21th century'
end) order by century
select left(categoryname,1) as [Category initial], count(eventid) as [Number of events],
cast(avg(cast(len(eventname) as float)) as decimal(5,2)) as [Average event name length] from tblCategory join tblEvent on
tblCategory.CategoryID = tblEvent.CategoryID group by left(categoryname,1)
select continentname as Continent, countryname as Country, count(eventid) as [Number of Events]
from tblContinent join tblCountry on tblContinent.ContinentID = tblCountry.ContinentID join
tblEvent on tblCountry.CountryID = tblEvent.CountryID group by Continentname, Countryname
select continentname as Continent, countryname as Country, count(eventid) as [Number of Events]
from tblContinent join tblCountry on tblContinent.ContinentID = tblCountry.ContinentID join
tblEvent on tblCountry.CountryID = tblEvent.CountryID where continentname != 'europe'
group by Continentname, Countryname
select continentname as Continent, countryname as Country, count(eventid) as [Number of Events]
from tblContinent join tblCountry on tblContinent.ContinentID = tblCountry.ContinentID join
tblEvent on tblCountry.CountryID = tblEvent.CountryID where continentname != 'europe'
group by Continentname, Countryname having count(eventid) >5
select AuthorName, DoctorName, count(episodeid) as Episodes from tblauthor join tblepisode
on tblauthor.authorid = tblepisode.authorid join tbldoctor on tblepisode.doctorid = tbldoctor.doctorid
group by authorname, doctorname having count(episodeid) >5 order by Episodes desc
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