NULL is an example of which type of value that does not change?

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Multiple Choice

NULL is an example of which type of value that does not change?

Explanation:
A constant is a value that does not change. NULL is a special constant in SQL that represents missing or unknown data. It isn’t a variable, which would be something you assign different values to as you process data. It isn’t a row, which is a full record composed of multiple fields. And it isn’t describing a column’s capability (nullable); that term refers to whether NULL can appear in a column, not to the value itself. So NULL fits as a fixed, unchanging value—the constant.

A constant is a value that does not change. NULL is a special constant in SQL that represents missing or unknown data. It isn’t a variable, which would be something you assign different values to as you process data. It isn’t a row, which is a full record composed of multiple fields. And it isn’t describing a column’s capability (nullable); that term refers to whether NULL can appear in a column, not to the value itself. So NULL fits as a fixed, unchanging value—the constant.

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