You have an SQL query that is running slowly, what would you do to improve it?

Technical screening consisted of these questions: What is multithreading, Java vs Python multithreading, GIL in Python, Thread vs Virtual Thread, Future vs Completable Future, ForkJoinPool vs WorkStealingPool, Java vs Python decorators, Java visitors, Java try-with resource vs Python with, What is AutoClosable, Comparator vs Comparable, SQL rank vs denserank, Java IO vs NIO, AWS SQS vs SNS, whats Saga pattern and how to implement it, Anonymous inner classes vs invokedynamic, Hashcollision in hashmap vs concurrenthashmap, how to process regular vs binary file in Java, types of proxies in Java, coding question of detect if graph is in loop.

Various GPGPU related questions that align with my role