What routing library or framework do you use in your projects?

SQL query performance optimization is the process of improving the efficiency of a database query to reduce its execution time and system load. This is achieved by choosing effective execution plans, minimizing read/write operations, and properly using indexes.

Main optimization methods:

• Using indexes to speed up data retrieval.
• Avoiding redundant or complex joins.
• Limiting the selection to necessary columns and rows (using WHERE clause in SELECT).
• Analyzing the execution plan (EXPLAIN) to identify bottlenecks.
• Caching frequently used data.

Example: if you have a users table and often search by email, creating an index on that field will make queries faster.