Sort operator in execution plans
Execution plans can tell us if and where a query used an internal sorting operation. Internal sorting is often required when using an operator in a query that checks for and removes duplicate rows.
You are given an execution plan of a query that returns all cities listed in the Earthquakes database. The query appends queries from the Nations and Cities tables. Use the following execution plan to determine if the appending operator used is UNION or UNION ALL
Deze oefening maakt deel uit van de cursus
Improving Query Performance in SQL Server
Oefeninstructies
- Add the operator that the execution plan indicates was used to append the queries.
Praktische interactieve oefening
Probeer deze oefening eens door deze voorbeeldcode in te vullen.
SELECT CityName AS NearCityName,
CountryCode
FROM Cities
___ -- Append queries
SELECT Capital AS NearCityName,
Code2 AS CountryCode
FROM Nations;