Handling NULL
Explore how to handle NULL values in T-SQL by using ISNULL to replace NULL with a specified value and COALESCE to return the first non-NULL value from multiple options. This lesson helps you manage missing data effectively in database queries.
We'll cover the following...
We'll cover the following...
Sometimes a row or an object will not contain any value (NULL), and we must handle such cases properly. For example, we might want to check whether a value is NULL and replace it with another value. T-SQL provides ISNULL() and COALESCE() methods for this purpose.
The ISNULL() function
This function checks whether a value is NULL. If it is NULL, then the function returns the value that is passed as the second parameter. Otherwise, the function returns ...