Using Crystal Report 8.5
Example
Personid Date 3100 22-02-2009 3100 22-02-2009 3100 22-02-2009 3200 22-02-2009 3200 22-02-2009 3200 22-02-20
Use This Steps......
1) Right click on the field, and select the “Format Field” menu.
2) Tick the Box that says: Suppress if duplicated
http://www.crystalreportsbook.com/Forum/forum_posts.asp?TID=11435
http://www.crystalreportsbook.com/Forum/forum_posts.asp?TID=8908