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Configuring Siebel eBusiness Applications > Configuring Tables and Columns > About Extension Tables > About Implicit JoinsUnderlying a 1:1 extension table's relationship with the base table and business component is a set of hidden relationships called an implicit join (also called implied join). The implicit join makes the extension table rows available on a 1:1 basis to the business component that uses the extension table. The name of the implicit join is the same name as the extension table. When a field in the business component is based on a column in the extension table, the Column property of the Field object is set to the name of the column, and the Join property is set to the name of the extension table. For example, the Industry field in the Contact business component has a Column property value of ATTRIB_48 and a Join property value of S_CONTACT_X. An implicit join is different from a join that you define as an object definition.
The details of the object definition relationships in an implicit join are illustrated in Figure 12. The following definitions participate in the implementation of the implicit join:
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