How can the SQL CTEs be consolidated to improve optimization?

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Combine multiple CTEs into a single CTE: Instead of using multiple CTEs, combine them into a single CTE that includes all the necessary data. This will help reduce the number of scans on the database tables and improve performance.

Use temporary tables: Instead of using CTEs, you can use temporary tables to store intermediate results. This can help improve optimization as temporary tables are stored in memory and can be accessed quickly.

Avoid recursive CTEs: Recursive CTEs can be slow and consume a lot of resources. If possible, try to rewrite the query using non-recursive CTEs or other techniques.

Optimizing CTEs for performance: You can optimize your CTEs by using indexes on the columns used in the CTEs. This will help to speed up the query execution time.

Proper use of Joins: Ensure the right types of joins are used in the CTE including INNER JOIN, LEFT JOIN, CROSS JOIN and OUTER JOIN to provide the right result depending on the requirement.

Use Column Alias: Use column aliases in your CTEs to make your code easy to read and identify all the reference points in your queries.

Use Simple queries: Avoid complex queries in your CTEs. The performance may not be optimal when the queries are complex.

Validate Execution Plans: Validate the execution plans when writing CTEs so you can identify if and where there are any performance bottlenecks.