EXCEPT
EXCEPT does the opposite of INTERSECT. It is used to check if data, present in one table, is absent in another.
You want to know which countries have no recorded earthquakes. You can get this information by comparing the Nations table with the Earthquakes table.
Este ejercicio forma parte del curso
Improving Query Performance in SQL Server
Instrucciones del ejercicio
- Add the country code column from the
Nationstable. - Add the operator that compares the two queries.
- Add the table with country codes to the right query.
Ejercicio interactivo práctico
Prueba este ejercicio y completa el código de muestra.
SELECT ___ -- Add the country code column
FROM Nations
___ -- Add the operator to compare the two queries
SELECT Country
FROM ___; -- Table with country codes