| Row(database) |
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Information AboutRow(database) |
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For example, in a table that represents companies, each row would represent a single company. Columns might represent things like company name, company street address, whether the company is publicly held, its VAT number, etc. In a table that represents ''the association'' of employees with departments, each row would associate one employee with one department. The implicit structure of a row, and the meaning of the data values in a row, requires that the row be understood as providing a succession of data values, one in each column of the table. The row is then interpreted as a Relvar composed of a set of Tuple s, with each tuple consisting of the two items: the name of the relevant column and the value this row provides for that column. Each column expects a data value of a particular Type . For example, one column might require a unique Identifier , another might require text representing a person's name, another might require an integer representing hourly pay in Cent s. |
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