List and describe the popular data integrity control methods. You may use examples to explain the control method
What will be an ideal response?
There are four popular data integrity control methods: default value, range control, referential integrity, and null value control. A default value is the value a field will assume unless an explicit value is entered for the field. Range control is when both numeric and alphabetic data may have a limited set of permissible values. The most common example of referential integrity is cross-referencing between relations. (The definition of referential integrity is given in a different chapter so the student may use an example). A null value is a special field value, distinct from a zero, blank, or any other value, that indicates that the value for the field is missing or otherwise unknown.
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