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
Cet exercice fait partie du cours
Improving Query Performance in SQL Server
Instructions
- Add the operator that the execution plan indicates was used to append the queries.
Exercice interactif pratique
Essayez cet exercice en complétant cet exemple de code.
SELECT CityName AS NearCityName,
CountryCode
FROM Cities
___ -- Append queries
SELECT Capital AS NearCityName,
Code2 AS CountryCode
FROM Nations;