Similarly, representation as a table implies a particular ordering to the rows and columns, whereas a relation is explicitly unordered.
An equally valid representation of a relation is as an n-dimensional chart, where n is the number of attributes (a table's columns).
For example, a relation with two attributes and three values can be represented as a table with two columns and three rows, or as a two-dimensional graph with three points.
This structure implies that a row can have repeating information, generally in the child data segments.
Unlike a spreadsheet, the datatype of a column is ordinarily defined by the schema describing the table.