Dell,
Ok, so I looked at your "Best Practices When Using Commands with Crystal Reports" (very helpful). when I looked at what you had and what Abhilash had, they appear to be the same basic idea. So I went into my existing sql command and add the following to my existing where clause:
AND ('{?ordered_by}' = '*ALL' OR o.ordered_by IN '{?ordered_by}')
I added a prompt {?ordered_by} as a string and checked the box for multiple values.
But when I click OK to save and close the command window, I get the following error:
Database Connection Error: '42000:[Microsoft][SQL Server Native Client 10.0][SQL Serer]Incorrect syntax near the keyword 'ALL'. [Database Vendor Code: 156 ]'