Question 17

Only character values can be restricted to single alphanumeric symbols.

A database field that requires values to be single alphanumeric symbols can only accept character data types, which are designed to store individual letters, digits, or symbols.

A) Integer

Integer data types are used to store whole numbers without any decimal points. Since integers cannot represent alphanumeric symbols or characters, they are not suitable for a field that requires single alphanumeric values.

B) Floating point

Floating point data types are designed for numbers that require decimal points. Similar to integers, floating point values do not support the storage of single alphanumeric symbols, making them inappropriate for this scenario.

C) Character

Character data types are specifically designed to hold individual characters, including single alphanumeric symbols. This makes them the ideal choice for a database field that needs to restrict entries to single alphanumeric values.

D) Character string

Character strings are used to store sequences of characters, which can include multiple alphanumeric symbols. However, they do not restrict the input to a single character, thus failing to meet the requirement of the question.

Conclusion

The character data type is the only option that can accurately restrict entries to single alphanumeric symbols, as it is specifically tailored for such values. All other options—integer, floating point, and character string—either do not support alphanumeric symbols or do not limit the input to a single character, thus rendering them unsuitable for this requirement.