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Answer: All of the above.
All the techniques mentioned are effective in optimizing SQL queries. Using EXPLAIN helps in understanding the execution plan, rewriting the query with subqueries and temporary tables can improve performance, and proper indexing of tables is crucial for query efficiency.
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You are optimizing a SQL query for a data pipeline that involves multiple joins and aggregations. The query currently takes a long time to execute. Which of the following techniques would you use to improve the query performance?
A
Use EXPLAIN to analyze the query execution plan and identify bottlenecks.
B
Rewrite the query to use subqueries and temporary tables for intermediate results.
C
Ensure that the tables involved in the query are properly indexed.
D
All of the above.
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