db join: Join statement is used to combine data or rows from two or more tables based on a common field between them. stored procedures: A stored procedure is a set of Structured Query Language (SQL) statements with an assigned name, which are stored in a relational database management system as a group, so it can be reused and shared by multiple programs. static: used for method or variable or class. In Java, a static member is a member of a class that isn't associated with an instance of a class. Instead, the member belongs to the class itself. As a result, you can access the static member without first creating a class instance no, string is reference type.