Joined Columns

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A joined column is a column whose values a database object "borrows" from its parent object. Such a column is borrowed in the sense that the column is not part of the child object proper. "Joined columns" are therefore also referred to as "virtual columns" (as opposed to "database columns").



collapseUnderstanding joined columns
collapseWhen to use joined columns ?
collapseHow to define a joined column



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