Question 17

Character data type should be used for single alphanumeric symbols.

Using the character data type is appropriate for restricting a database field to single alphanumeric symbols, as it can store individual characters effectively.

A) Character string

Character strings are designed to hold sequences of characters, which can include multiple alphanumeric symbols. This option is incorrect because the requirement is for a single alphanumeric symbol, not a string of characters.

B) Floating point

Floating point data types are used for representing decimal numbers and are not suitable for storing alphanumeric symbols. Therefore, this option does not meet the requirement of restricting values to single alphanumeric symbols.

C) Integer

Integers are used exclusively for whole numbers and cannot accommodate alphanumeric symbols, making this choice incorrect. The requirement specifically calls for alphanumeric values, which integers cannot represent.

D) Character

The character data type is specifically designed to store single alphanumeric symbols, making it the most suitable choice. It allows for the precise restriction of a database field to individual characters, fulfilling the requirement.

Conclusion

The character data type is definitively the correct choice as it directly supports the need for single alphanumeric symbols in a database field. Other options fail to meet the requirement, either by allowing multiple characters or being unsuitable for alphanumeric values altogether. Thus, option D is the only appropriate solution.