Question

The NULLIF function is often combined with the NVL2 function to display a descriptive status. _________________________ ​

Answer 1

The NULLIF function returns NULL if two expressions are equal, and when combined with the NVL2 function, it can help in displaying descriptive messages or statuses based on the presence or absence of NULL values in data fields.

Step-by-step explanation:

The NULLIF function is a SQL function that returns NULL if two expressions are equal, otherwise it returns the first expression. It is often combined with the NVL2 function to display a descriptive status. The NVL2 function takes three arguments: the first argument is the value to check for NULL, the second is the value to return if the first argument is not NULL, and the third is the value to return if the first argument is NULL. Using NULLIF and NVL2 together, you can compare values and convert the result to a more meaningful status message or default value if necessary. For example, if you want to check if a salary is equal to a certain value and display a message accordingly, you can use these functions in combination to do that effectively.

The NULLIF function is often combined with the NVL2 function to display a descriptive status. The NULLIF function is used to compare two expressions and return NULL if they are equal, and the non-NULL value if they are not equal. The NVL2 function is used to return one value if a condition is true, and another value if the condition is false.