Question

​ Which of the following functions can be used to substitute another value for a NULL value during calculations?

Answer 1

The function that can be used to substitute another value for a NULL value during calculations is the NVL function.

The answer is option ⇒1

Step-by-step explanation:

The NVL function is commonly used in database systems to handle NULL values. It takes two arguments: the first argument is the value to be checked for NULL, and the second argument is the value to substitute in case the first argument is NULL.

Here's an example of how the NVL function can be used:

NVL(salary, 0)

In this example, the NVL function is checking the "salary" column for NULL values. If the "salary" is NULL, it will be replaced with 0. This ensures that calculations involving the "salary" column will still produce meaningful results, even if some rows have NULL values.

Other similar functions that can be used in different database systems include:

• - ISNULL: This function is used in SQL Server to substitute a value for NULL. It takes two arguments, similar to the NVL function.
• - COALESCE: This function is more versatile and can handle multiple arguments. It returns the first non-NULL value from a list of arguments.
• - IFNULL: This function is used in MySQL to substitute a value for NULL. It takes two arguments, similar to the NVL function.

These functions provide flexibility in handling NULL values during calculations and allow for more robust data processing in database systems.

The answer is option ⇒1

Your question is incomplete, but most probably the full question was:

Which of the following functions can be used to substitute another value for a NULL value during calculations?

1. NVL
2. DY
3. SP
4. SUBSTR