That database evaluates your entries based on a set of criteria.
If you slide in your name into a zip code field, the database gives you an error.
That’s because the database tests your entry against the domain defined for the zip code field.
alexsl / Getty Images
A domain is basically a data punch in that can include optional restrictions.
See your database’s documentation for details.
Or, a database designer might choose to define it instead as a character, usually called a CHAR.
What Is Domain Integrity?
For example, the execution statement creates a ZipCode attribute of data jot down CHAR with five characters.
A NULL, or unknown value, is not allowed.
The range of the data must fall between 00000 and 99999.
That creates a ZipCode attribute of data throw in CHAR with five characters.
A NULL, or unknown value, is not allowed.
