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Row (database)

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Title: Row (database)  
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Subject: Relational model, Log trigger, Column (database), Relational database, SQL
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Row (database)

In the context of a relational database, a row—also called a record or tuple—represents a single, implicitly structured data item in a table. In simple terms, a database table can be thought of as consisting of rows and columns or fields.[1] Each row in a table represents a set of related data, and every row in the table has the same structure.

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.

In a less formal usage, e.g. for a database which is not formally relational, a record is equivalent to a row as described above, but is not usually referred to as a row.

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 tuples, 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 cents.

- Column 1 Column 2
Row (Record) 1 Row 1, Column (Field)1 Row 1, Column 2
Row 2 Row 2, Column 1 Row 2, Column 2
Row 3 Row 3, Column 1 Row 3, Column 2

References

  1. ^ "What is a database row?" Cory Janssen, Techopedia, retrieved 27 June 2014

See also

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