What is Null ? Null means no data or missing data or we don't have a data in a table . If you think Null means 0 ( zero ) than you are wrong . There can be two condition for Null 1) when SQL is Null 2 ...

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.

Therefore, using NULL should be a conscious decision, not a default choice. Ultimately, your qualification to use NULL in SQL depends on your understanding of its nuances and your ability to implement ...

Christopher Null has a very unfortunate surname – in the SQL programming language that is used to communicate with databases, "null" is a reserved term meaning that the value of a string (text ...