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  3. Improving Query Performance in SQL Server

Exercise

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

Execution plan for appending queries exercise

Instructions

100 XP
  • Add the operator that the execution plan indicates was used to append the queries.