Answer & Solution
Answer: Option D
Solution:
All three of the listed SQL group functions,
MAX,
COUNT, and
SUM, have the ability to ignore NULL values when processing data within their respective functions. Here's a brief explanation of each option:
Option A:
MAX
The
MAX function is used to find the maximum (largest) value in a set of values. It can operate on a column and will return the maximum value, ignoring NULL values in that column.
Option B:
COUNT
The
COUNT function is used to count the number of rows in a result-set or the number of non-NULL values in a specific column. It ignores NULL values when counting.
Option C:
SUM
The
SUM function is used to calculate the sum of all values in a numeric column. It adds up all the non-NULL values and produces a result, ignoring NULL values.
Option D:
All of the above
This option is correct because all of the mentioned group functions (
MAX,
COUNT, and
SUM) have the capability to ignore NULL values when performing their respective operations.
So, the correct answer is
Option D: All of the above.
