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ð Case Sensitive

Specifies that the data values will be case sensitive.  
 
 
ð Message

Specifies the messages for various error conditions.  
 
Message on insert of a Unique value which is not unique  
The message that will be displayed to a user attempting to insert a row with a field value which already exists in the table.  

Message on delete of a Unique value also in a referencing FK  
The message that will be displayed to a user attempting to delete a row with a field value which is referenced by a Foreign Key in another table.  

Message on update of a Unique value also in referencing FK  
The message that will be displayed to a user attempting to update a row with a field value which is referenced by a Foreign Key in another table.  


For more information on Indexes, please see Types of Constraints.