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VIRTUAL COLUMNS

  • US 20120036111A1
  • Filed: 10/20/2011
  • Published: 02/09/2012
  • Est. Priority Date: 12/06/2007
  • Status: Abandoned Application
First Claim
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1. A computer-implemented method for maintaining referential integrity between two tables, comprising:

  • receiving a designation that a first column in a first table is a primary key,wherein the first column is a virtual column,wherein a DBMS defines the virtual column as containing results of an expression, andwherein a virtual column comprises at least one data value computed from an expression or a function;

    receiving a designation that a second column in a second table is a foreign key; and

    maintaining referential integrity between data values in the first column and data values in the second column.

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