Define a relation
A relation is a two-dimensional table in which:
1 . The entries in the table are single-valued; that is, each location in the table contains a single entry.
2 . Each column has a distinct name (technically called the attribute name).
3 . All values in a column are values of the same attribute (that is, all entries must match the column name).
4 . The order of columns is immaterial.
5 . Each row is distinct.
6 . The order of rows is immaterial.
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