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.
As the name suggests, varchar is a varying character or varying char. Syntax of varchar is VARCHAR [(n|max)]. Varchar stores ASCII data that is non-Unicode data, and it is the data type which are used in normal usage. Varchar uses one byte per character. It also stores the length of each string in the database.