NOT IN with IS NOT NULL
You want to know which country capitals have never been the closest city to recorded earthquakes. You decide to use NOT IN to compare Capital from the Nations table, in the outer query, with NearestPop, from the Earthquakes table, in a sub-query.
Deze oefening maakt deel uit van de cursus
Improving Query Performance in SQL Server
Praktische interactieve oefening
Probeer deze oefening eens door deze voorbeeldcode in te vullen.
SELECT WorldBankRegion,
CountryName,
___ -- Capital city name column
FROM Nations
WHERE Capital NOT IN
(SELECT ___ -- City name column
FROM Earthquakes);