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 vs Varchar. Char and varchar are the most highly used character data type available in databases. Char is used to store a string with a fixed length while varchar is used to store strings that have a varying length. In order to get a better performance from the data, it is more important to choose the correct data types for the fields of the tables in your database.