1. Each row of the table holds data that pertain to some entity or a portion of some entity. 2. Each column of the table contains data that represent an attribute of the entity. 3. The cells of the table must hold a single value, and thus no repeating elements are allowed in a cell. 4. All the entries in any column must be of the same kind. 5. Each column must have a unique name. 6. The order of the columns within the table is unimportant. 7. The order of the rows is unimportant. 8. The set of data values in each row must be unique—no two rows in the table may hold identical sets of data values.
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