Question 67

Character

The appropriate data type to restrict a database field to only single alphanumeric symbols is the Character data type. This type allows for the storage of individual characters, which can include letters and numbers, thus meeting the requirement for single alphanumeric symbols.

A) Floating point

Floating point data types are used to represent numbers that have a fractional component. They are not suitable for restricting to single alphanumeric symbols since they can store complex numerical values rather than individual characters.

B) Character string

While character strings can store sequences of characters, they are not limited to a single character. This makes them inappropriate for a field that specifically needs to accept only single alphanumeric symbols, as they could potentially contain multiple characters.

C) Integer

Integer data types are used for whole numbers and do not accommodate alphanumeric symbols at all. Since the requirement is to allow alphanumeric characters, integers are not a valid choice for this field.

D) Character

The Character data type is designed to hold a single character, which can be an alphanumeric symbol. This aligns perfectly with the requirement to restrict the field to only those values.

Conclusion

The Character data type is the definitive choice for this scenario as it explicitly allows only single characters, which can be alphanumeric. Other options fail to meet the criteria; Floating point and Integer cannot represent characters, while Character string allows for multiple characters, which is not suitable. Thus, Character is the only correct answer.