Table Linking in Crystal Reports
"This document demonstrates the linking process in Crystal Reports (CR) 7 and later. This document discusses linking for PC-type databases, ODBC linking and frequently asked questions. The linking processes are based on matching records, from a parent table (left table) to records in a child table (right table). The match is based on whether the value in the link field in the source record is identical to the value of the link field in the searched records. The linking process is a form of record selection."