Crystal Reports for Eclipse Designer Guide

Using subreports with unlinkable data

Tables can be linked in a report as long as the following criteria are met:
  • The link fields are both database fields.
  • The link fields contain similar data.
  • The link fields are the same length.
  • The link field in the link to (lookup) table is indexed (PC databases only).
Linking tables is rarely a problem. However, there are some circumstances in which you cannot coordinate data from different tables because the data does not meet the linking criteria.
For example, linking to or from a formula field, or linking two unindexed tables cannot be done in a single report. Subreports must be used.



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