What are the steps to improve the performance of a sql query?

Question

Accepted Answer

Steps to improve SQL query performance

Optimize the query by using appropriate indexes
Minimize the use of functions and calculations in the query
Avoid unnecessary joins and subqueries
Retrieve only the required columns instead of selecting all
Use query hints or optimizer directives if necessary
Analyze and optimize the database schema and table structures
Consider partitioning large tables
Monitor and tune the database server configuration
Cache frequently accessed data
Consider denormalizing data for performance gains

Accepted Answer

1. Check the query and requirement for that query. That will give you some idea what should have been done and what has been done in the query. 
2. Add a covering index if applicable. 
3. Use of loop joins and hash joins wherever applicable. 
4. Use the indexed views if possible.

What are the steps to improve the performance of a sql query?

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