Link tables store information about paired object instances in your system. In the Pega 7 Platform database, the names of link tables start with the values pc_link and pr_link.
The following tables can hold instances of concrete classes derived from the Link-base class:
Table | Description |
pr_link_attachment | Supports the association of a work item attachment with a work item, as instances of the Link-Attachment class. Contains one row for each attachment. |
pc_link_folder | Supports the association of a work item with a folder, as instances of the Link-Folder class. This can be a many-to-many relation. |
pr_link_work_tag | Supports the association of a tag with a work item. Corresponds to the Link-Tag class. |
pc_link_topcase | Supports the Link-TopCase class, which links a child case type to the top-level case type that it is associated with. Used to retrieve the parent of a child case type or to get a list of child case types. |
pr_link_usecase | Supports the association of an Application Specification rule with an activity, flow, or other rules that provide the implementation of that specification. Also supports the association of an application requirement rule with an application rule. Corresponds to the Link-Requirement and Link-UseCase classes. |
pr_link_pmf_rulechanges | Supports the Link-Project class to display and report on rule changes associated with project items via the View Rule Changes link on the Project Worklist. |
pr_link | Not used by any standard class. Default table for instances of other Link- classes. |