Every business has restrictions on which attribute values and which relationships are allowed. These are known as:
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Constraints are useful because they allow a designer to specify the semantics of Domain restricts the values of attributes in the relation and is a constraint
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Explanation:
Every row in the table represents a collection of related data values.
These rows in the table denote a real-world entity or relationship.
The table name and column names are helpful to interpret the meaning of values in each row.
The data are represented as a set of relations.
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