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Details for roqovzki

roqovzki has participated in the following threads:

Added by roqovzki on 12 Feb 2024 at 23:13

So, this is my pretty simple or maybe even dumb query (as I'm a beginner), but I came across this exercise and it seems to me that the solution given in the files and most of the users replies are incorrect.

I belivee most of the solutions miss out on one year of each century, as the century lasts from XX01-01-01 till XX00-12-31.
Let me know guys whether I'm completely missing on something.

SELECT

COUNT(*)

,CASE

WHEN EventDate BETWEEN '1701-01-01' AND '1800-12-31' THEN '18th century'

WHEN EventDate BETWEEN '1801-01-01' AND '1900-12-31' THEN '19th century'

WHEN EventDate BETWEEN '1901-01-01' AND '2000-12-31' THEN '20th century'

WHEN EventDate BETWEEN '2001-01-01' AND '2100-12-31' THEN '21th century'

END AS [Century]

FROM

tblEvent

GROUP BY CUBE

(CASE

WHEN EventDate BETWEEN '1701-01-01' AND '1800-12-31' THEN '18th century'

WHEN EventDate BETWEEN '1801-01-01' AND '1900-12-31' THEN '19th century'

WHEN EventDate BETWEEN '1901-01-01' AND '2000-12-31' THEN '20th century'

WHEN EventDate BETWEEN '2001-01-01' AND '2100-12-31' THEN '21th century'

END)


--------------------------------------------------------
WiseOwl query I believe should be like this:

SELECT

-- derive the century

CASE

WHEN year(e.EventDate) < 1801 THEN '18th century'

WHEN year(e.EventDate) < 1901 THEN '19th century'

WHEN year(e.EventDate) < 2001 THEN '20th century'

ELSE '21st century'

END AS Century,

COUNT(*) AS 'Number events'

FROM

tblEvent AS e

GROUP BY

-- need to group by the century too (the CUBE function shows the grand total too)

CUBE(

CASE

WHEN year(e.EventDate) < 1801 THEN '18th century'

WHEN year(e.EventDate) < 1901 THEN '19th century'

WHEN year(e.EventDate) < 2001 THEN '20th century'

ELSE '21st century'

END

)

ORDER BY

Century

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