Microsoft Fabric Analytics Engineer Associate DP-600
Get started today
Ultimate access to all questions.
In the context of SQL query performance, explain how you would identify and resolve bottlenecks in a query that joins multiple large tables. Provide specific examples of SQL optimizations that could be applied. Additionally, discuss how the choice of join types (e.g., INNER JOIN, LEFT JOIN) can impact performance.
In the context of SQL query performance, explain how you would identify and resolve bottlenecks in a query that joins multiple large tables. Provide specific examples of SQL optimizations that could be applied. Additionally, discuss how the choice of join types (e.g., INNER JOIN, LEFT JOIN) can impact performance.
Simulated
Explanation:
Using subqueries to filter data before joining can reduce the amount of data that needs to be processed during the join operation, thereby improving performance. This approach is particularly effective when one or more of the tables involved in the join have a large number of rows that can be eliminated early in the query execution process.