What methods can be used to speed up the execution of long SQL queries?

To speed up long SQL queries, the following methods can be used:

• Indexing: creating indexes on columns involved in WHERE conditions, JOINs, or sorting.
• Query optimization: rewriting queries to reduce the number of operations, using more efficient constructs (for example, replacing subqueries with JOINs).
• Using EXPLAIN: analyzing the query execution plan to identify bottlenecks.
• Caching results: if data does not change often, query results can be cached.
• Partitioning large queries: splitting complex queries into several simpler ones.
• Updating database statistics: so the query optimizer has up-to-date information.
• Using table partitioning: for working with large volumes of data.

Example of indexing in SQL:

CREATE INDEX idx_customer_name ON Customers(Name);

This will speed up searching by name in the Customers table.