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.
Char, nchar, varchar and nvarchar are all used to store text or string data in SQL Server databases. 1  char - is the SQL-92 synonym for character. 2  nchar - is the SQL-92 synonym for national char and national character.  varchar - is the SQL-92 synonym for character varying.