Question 18

Character is the appropriate data type for restricting values to single alphanumeric symbols.

Using the character data type ensures that the field can only contain single alphanumeric symbols, making it ideal for this requirement.

A) Character string

Character strings can hold multiple characters, meaning they are not suitable for a field restricted to single alphanumeric symbols. This would allow for more than one character, which does not meet the specified requirement.

B) Integer

The integer data type is designed for numeric values without decimals and cannot accommodate alphanumeric symbols. Therefore, it is not appropriate for a field requiring single alphanumeric symbols.

C) Floating point

Floating point data types are used for numbers that require decimal points and are not applicable for storing alphanumeric symbols. Thus, this option cannot fulfill the requirement of holding single alphanumeric characters.

D) Character

The character data type is specifically meant for storing single characters, including alphanumeric symbols. This makes it the correct choice for ensuring that the database field only accepts single alphanumeric symbols.

Conclusion

Character is definitively the right choice because it uniquely restricts values to single alphanumeric symbols, fulfilling the requirement of the database field. All other options fail to meet this criterion either by allowing multiple characters or by being incompatible with alphanumeric symbols.