Learn how to optimize SQL queries for NULL values by following some best practices and techniques, such as using IS NULL or IS NOT NULL operators, avoiding NOT IN with NULL values, and more.

Using IS NOT NULL in a WHERE clause can negatively impact performance. It forces the optimizer to do a full table scan, rather than an indexed read for the column used in the WHERE clause. So, in our ...

NULL signifies nothingness, while empty strings and zeroes represent actual data. This distinction is crucial for comparisons and calculations. For example, comparing NULL to any value, including ...

For example, NOT NULL assigned to the field CUSTOMER in the table SASDEMO.CUSTOMER does not allow a row to be added unless there is a value for CUSTOMER. Columns can also be defined as NOT NULL WITH ...