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.
Understanding Data Type Differences. There are a number of differences between the Java programming language data types and SQL Server data types. The Microsoft JDBC Driver for SQL Server helps to facilitate those differences through various types of conversions. The JDBC character string data types are CHAR, VARCHAR, and LONGVARCHAR.