STATISTICS IO: Example 2
In the previous exercise, you were asked you to provide a new regional manager daily updates on orders shipped to Western Europe capital cities. You initially created a query that contained two sub-queries. You decide to do a rewrite and use an INNER JOIN.
The STATISTICS IO command is turned on. You will need to turn it off after completing the query.
Cet exercice fait partie du cours
Improving Query Performance in SQL Server
Exercice interactif pratique
Essayez cet exercice en complétant cet exemple de code.
-- Example 2
SELECT c.CustomerID,
c.CompanyName,
COUNT(o.CustomerID)
FROM Customers AS c
___ ___ Orders AS o -- Join operator
ON c.CustomerID = o.CustomerID
WHERE o.___ IN -- Shipping destination column
('Berlin','Bern','Bruxelles','Helsinki',
'Lisboa','Madrid','Paris','London')
GROUP BY c.CustomerID,
c.CompanyName;