Examlex
Which of the following statements is true of a barter system?
Number Field
A type of data field that allows only numerical input, used in databases and forms to ensure data consistency.
Is Not Null
A condition or expression in programming and database management that checks for the presence of any value in a specific field, ensuring that it is not empty.
Is Null
A term used in databases and programming to indicate that a field or variable has no value assigned to it.
Product Type Field
A specific field in a database or software application used to categorize products by their types.
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