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.
VARCHAR2(size): A variable-length character string with a maximum size of 4000 bytes. It differs from the CHAR datatype that itÂ´s not padded the space to its maximum length with blank. The size is the number of characters to store. ItÂ´s currently a synonymous of VARCHAR.