The not() function:

The not() function is primarily used in the context of filtering data or creating conditions in a query. When you use the not() function, it effectively negates the specified conditions within the query. This negation can lead to a more complex query generation compared to straightforward conditions, thus making the overall execution slower, especially with large datasets.

This is because the not() function does not simply retrieve data based on a direct match; it has to evaluate the conditions to determine which records do not meet the criteria. Consequently, this complexity can impact performance, impacting how quickly results are returned when executing the query.

Understanding this performance impact is crucial for developers when designing queries, especially in applications that deal with significant amounts of data. This information is valuable for optimizing application performance and ensuring efficient data retrieval.