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Specifies whether a header cell is a header for a column (scope="col"), row (scope="row"), group of columns (colspan="2" scope="colgroup"), or group of rows (rowspan="2" scope="rowgroup"). It has no visual effect, but is used by screen readers and is recommended according to accessibility guidelines .
The two most commonly used classes are "wikitable" and "wikitable sortable"; the latter allows the reader to sort the table by clicking on the header cell of any column. |+ caption Required for accessibility purposes on data tables, and placed only between the table start and the first table row. ! header cell Optional.
And it will do it correctly for tables with row headers too (see also Help:Table#Row headers). Tab2wiki will not compress the wikitext at all if this is checked: "First element in a row is a header". Note: The visual editor will copy templates (as in a column of country/state/province names with flag templates), but it will not copy inline ...
wikitable – provides column headers with bold font on shaded background, and other common style. See here for details. This class should be used for almost all tables, unless there is a reason not to. sortable – adds up & down icons to column headers which enable
[2]: 113 Column headers are sometimes included as the first line, and each subsequent line is a row of data. The lines are separated by newlines . For example, the following fields in each record are delimited by commas, and each record by newlines:
Tables can only be sorted vertically by clicking on the column headers (topmost cells). When a column header is clicked, the rows of the table reorder themselves in an up-and-down manner, based on the values in that column. However, there is no functionality to sort columns horizontally by clicking on a cell in the leftmost row.
Relation, tuple, and attribute represented as table, row, and column respectively. In database theory, a relation, as originally defined by E. F. Codd, [1] is a set of tuples (d 1,d 2,...,d n), where each element d j is a member of D j, a data domain. Codd's original definition notwithstanding, and contrary to the usual definition in ...
A table in a SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints, and SQL queries correspond to predicates. However, SQL databases deviate from the relational model in many details , and Codd fiercely argued against deviations that compromise the original principles.