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  2. Help:Cite errors/Cite error empty references define - Wikipedia

    en.wikipedia.org/wiki/Help:Cite_errors/Cite...

    Please reference this page and the page where you have the problem so we can understand your issues. For basic information on the footnotes system, see Referencing for beginners ; for advanced help, see Footnotes .

  3. Help:Sortable tables - Wikipedia

    en.wikipedia.org/wiki/Help:Sortable_tables

    Date sorting does not work for columns with only the year before the month (no day). Adding data-sort-type=date or data-sort-type=isoDate to the column header does not help. Click each column header a couple times in the tables below to see. Note the column headed data-sort-type=isoDate may sort correctly in some browsers, but it is not reliable.

  4. Data cleansing - Wikipedia

    en.wikipedia.org/wiki/Data_cleansing

    Set-Membership constraints: The values for a column come from a set of discrete values or codes. For example, a person's sex may be Female, Male or Non-Binary. Foreign-key constraints: This is the more general case of set membership. The set of values in a column is defined in a column of another table that contains unique values.

  5. Help:Cite errors/Cite error references missing key - Wikipedia

    en.wikipedia.org/wiki/Help:Cite_errors/Cite...

    Please reference this page and the page where you have the problem so we can understand your issues. For basic information on the footnotes system, see Referencing for beginners ; for advanced help, see Footnotes .

  6. Referential integrity - Wikipedia

    en.wikipedia.org/wiki/Referential_integrity

    A table (called the referencing table) can refer to a column (or a group of columns) in another table (the referenced table) by using a foreign key. The referenced column(s) in the referenced table must be under a unique constraint, such as a primary key. Also, self-references are possible (not fully implemented in MS SQL Server though [5]).

  7. Help:Citation tools - Wikipedia

    en.wikipedia.org/wiki/Help:Citation_tools

    Reference exporter; Reference Organizer presents all references in graphical user interface, where you can choose whether the references should be defined in the body of article or in the reference list template(s) (list-defined format). You can also sort the references in various ways (and optionally keep the sort order), and rename the ...

  8. Help:Table - Wikipedia

    en.wikipedia.org/wiki/Help:Table

    There is a way to break up a table (a too-wide table for example) into more tables without losing all the background colors, and other inline styling. Copy the table to 2 sandboxes (or one sandbox, and in the article itself). Then delete the columns not needed on one of the new tables.

  9. Help:Cite errors - Wikipedia

    en.wikipedia.org/wiki/Help:Cite_errors

    A list-defined reference has a conflicting group attribute "$1" (see the help page). A list-defined reference named "$1" is not used in the content (see the help page). A list-defined reference has no name (see the help page). The named reference "$1" was defined multiple times with different content (see the help page).