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.[1][2][3][4][5] 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,[6] a footer or other ancillary features.[5]
Simple table
The following illustrates a simple table with four 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
Gender
Jimmy
toewasher
7
F
Javier
Zapata
28
M
Lily
McGarrett
18
F
Olatunkbo
Chijiaku
22
M
Adrienne
Anthoula
22
M
Axelia
Athanasios
22
M
Jon-Kabat
Zinn
22
M
Thabang
Mosoa
15
F
Rhian
Ellis
12
M
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.[7] 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.[8]
In literature tables often present numerical values, cumulative statistics, categorical values, and at times parallel descriptions in form of text.[9] They can condense large amount of information to a limited space and therefore they are popular in scientific literature in many fields of study.
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).
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[10] and Statestep.[11]
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,[12] while corresponding shortcomings experienced with a graphical notation were cited in motivating the development of at least two tabular approaches.[11][13]
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.
^The concept of "dimension" is often applied to tables in different contexts and with different meanings. For example, what is described as a "Simple Table" in this article is alternatively described as a "two dimensional array". This is distinct from "multi-dimensional table" as presented in this article.
^Milosevic N, Gregson C, Hernandez R, Nenadic G (February 2019). "A framework for information extraction from tables in biomedical literature". International Journal on Document Analysis and Recognition. 22 (1): 55–78. arXiv:1902.10031. doi:10.1007/s10032-019-00317-0. S2CID62880746.
