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^ Cite error: The named reference foo was invoked but never defined (see the help page). Cite error: A list-defined reference with the name "foo" has been invoked, but is not defined in the <references> tag (see the help page ).
The named reference $1 was invoked but never defined (see the help page). displays for both references. This can be very confusing, as the order of references in the list may not match the order used in the content. If {} is used and the |refs= parameter is missing or malformed. If a named reference is invoked within the reference list markup:
The allowed syntax of table:formula was not defined in sufficient detail in the OpenDocument version 1.0 specification, which defined spreadsheet formulas using a set of simple examples showing, for example, how to specify ranges and the SUM() function. The OASIS OpenDocument Formula sub group therefore standardized the table:formula in the ...
Sometimes the reference list markup exists, but the message is shown because the <ref> tag immediately before the reference list markup does not have a closing </ref> or it is malformed, thus hiding the rest of the text in the article, including the reference list.
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).
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]).
easily adding a new column if many elements of the new column are left blank (if the column is inserted and the existing fields are unnamed, use a named parameter for the new field to avoid adding blank parameter values to many template calls) computing fields from other fields, e.g. population density from population and area
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.