Description: Non-deterministic functions in SQL are those that can return different results each time they are invoked with the same input parameters. This contrasts with deterministic functions, which always produce the same result for a given set of inputs. Non-deterministic functions are particularly useful in situations where variability or randomness is required, such as in generating unique values or in randomly selecting records. These functions may depend on external factors, such as time or system state, contributing to their unpredictable nature. In the context of SQL and database systems in general, the use of non-deterministic functions can influence the performance and execution of queries, as the database engine must handle variability in results. Therefore, it is crucial to understand how and when to use them to avoid performance issues and ensure data integrity. Non-deterministic functions are a powerful tool in a database developer’s arsenal, allowing for the creation of more dynamic and adaptive queries.
