Secondary Navigation. 1  Active Duty Dental Care. 2  Guard/Reserve Dental Care. 3  TRICARE Dental Program. 4  TRICARE Retiree Dental Program. 5  Enrolling in the TRICARE Retiree Dental Program. Costs. 6  Dental Benefits for Survivors. 7  Find a Dentist.
â¢ Although char and varchar are character data fields, char is a fixed length data field and varchar is a variable size data field. â¢ Char can store only fixed size non-Unicode string characters, but varchar can store variable sizes of strings.
All replies. 1  The main difference between these 2 data types is that an NCHAR data type is fixed-length while an NVARCHAR is variable-length. 2  Farhan, Thank you for your reply. 3  Martin, According to documentation. 4  Farnhan, You mean a mix up with the documentation, I presume.