Table (information)

An example table rendered in a web browser using HTML.

A table is an arrangement of information or data, typically in rows and columns, or possibly in a more complex structure. Tables are widely used in communication, research, and data analysis. Tables appear in print media, handwritten notes, computer software, architectural ornamentation, traffic signs, and many other places. The precise conventions and terminology for describing tables vary depending on the context. Further, tables differ significantly in variety, structure, flexibility, notation, representation and use. Information or data conveyed in table form is said to be in tabular format (adjective). In books and technical articles, tables are typically presented apart from the main text in numbered and captioned floating blocks.

Basic description

A table consists of an ordered arrangement of rows and columns. This is a simplified description of the most basic kind of table. Certain considerations follow from this simplified description:

• the term row has several common synonyms (e.g., record, k-tuple, n-tuple, vector);
• the term column has several common synonyms (e.g., field, parameter, property, attribute, stanchion);
• a column is usually identified by a name;
• a column name can consist of a word, phrase or a numerical index;
• the intersection of a row and a column is called a cell.

The elements of a table may be grouped, segmented, or arranged in many different ways, and even nested recursively. Additionally, a table may include metadata, annotations, a header, a footer or other ancillary features.

Simple table

The following illustrates a simple table with three columns and nine rows. The first row is not counted, because it is only used to display the column names. This is called a "header row".

Age table

First name	Last name	Age
Tinu	Elejogun	14
Javier	Zapata	28
Lily	McGarrett	18
Olatunkbo	Chijiaku	22
Adrienne	Anthoula	22
Axelia	Athanasios	22
Jon-Kabat	Zinn	22
Thabang	Mosoa	15
Rhian	Ellis	12

Multi-dimensional table

An example of a table containing rows with summary information. The summary information consists of subtotals that are combined from previous rows within the same column.

The concept of dimension is also a part of basic terminology. Any "simple" table can be represented as a "multi-dimensional" table by normalizing the data values into ordered hierarchies. A common example of such a table is a multiplication table.

Multiplication table

×	1	2	3
1	1	2	3
2	2	4	6
3	3	6	9

In multi-dimensional tables, each cell in the body of the table (and the value of that cell) relates to the values at the beginnings of the column (i.e. the header), the row, and other structures in more complex tables. This is an injective relation: each combination of the values of the headers row (row 0, for lack of a better term) and the headers column (column 0 for lack of a better term) is related to a unique cell in the table:

• Column 1 and row 1 will only correspond to cell (1,1);
• Column 1 and row 2 will only correspond to cell (2,1) etc.

The first column often presents information dimension description by which the rest of the table is navigated. This column is called "stub column". Tables may contain three or multiple dimensions and can be classified by the number of dimensions. Multi-dimensional tables may have super-rows - rows that describe additional dimensions for the rows that are presented below that row and are usually grouped in a tree-like structure. This structure is typically visually presented with an appropriate number of white spaces in front of each stub's label.

In literature tables often present numerical values, cumulative statistics, categorical values, and at times parallel descriptions in form of text. They can condense large amount of information to a limited space and therefore they are popular in scientific literature in many fields of study.

Generic representation

As a communication tool, a table allows a form of generalization of information from an unlimited number of different social or scientific contexts. It provides a familiar way to convey information that might otherwise not be obvious or readily understood.

For example, in the following diagram, two alternate representations of the same information are presented side by side. On the left is the NFPA 704 standard "fire diamond" with example values indicated and on the right is a simple table displaying the same values, along with additional information. Both representations convey essentially the same information, but the tabular representation is arguably more comprehensible to someone who is not familiar with the NFPA 704 standard. The tabular representation may not, however, be ideal for every circumstance (for example because of space limitations, or safety reasons).

File:Philosophical Transactions - Volume 001.djvu

Adrien Auzout's "A TABLE of the Apertures of Object-Glasses" from a 1665 article in Philosophical Transactions

Fire diamond

Standard Representation		Tabular Representation
2 3 1		Risk levels of hazardous materials in this facility Health Risk Flammability Reactivity Special Level 3 Level 2 Level 1

Specific uses

There are several specific situations in which tables are routinely used as a matter of custom or formal convention.

Publishing

• Cross-reference (Table of contents)

Mathematics

Main article: Mathematical table

• Arithmetic (Multiplication table)
• Logic (Truth table)

Natural sciences

• Chemistry (Periodic table)
• Oceanography (tide table)

Information technology

Software applications

Modern software applications give users the ability to generate, format, and edit tables and tabular data for a wide variety of uses, for example:

• word processing applications;
• spreadsheet applications;
• presentation software;
• tables specified in HTML or another markup language

Software development

Tables have uses in software development for both high-level specification and low-level implementation. Usage in software specification can encompass ad hoc inclusion of simple decision tables in textual documents through to the use of tabular specification methodologies, examples of which include Software Cost Reduction and Statestep. Proponents of tabular techniques, among whom David Parnas is prominent, emphasize their understandability, as well as the quality and cost advantages of a format allowing systematic inspection, while corresponding shortcomings experienced with a graphical notation were cited in motivating the development of at least two tabular approaches.

At a programming level, software may be implemented using constructs generally represented or understood as tabular, whether to store data (perhaps to memoize earlier results), for example, in arrays or hash tables, or control tables determining the flow of program execution in response to various events or inputs.

Databases

Database systems often store data in structures called tables; in which columns are data fields and rows represent data records.

Historical relationship to furniture

In medieval counting houses, the tables were covered with a piece of checkered cloth, to count money. Exchequer is an archaic term for the English institution which accounted for money owed to the monarch. Thus the checkerboard tables of stacks of coins are a concrete realization of this information.

See also

• Chart
• Diagram
• Abstract data type
• Column (database)
• Information graphics
• Periodic table
• Reference table
• Row (database)
• Table (database)
• Table (HTML)
• Tensor
• Dependent and independent variables

External links

• Media related to at Wikimedia Commons