java gia ton giwgo

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package javaapplication8;
import java.sql.*;
/**

 * @author Denis
 */
public class JavaApplication8 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)  throws SQLException {
        doPrint();
    }
     public static void doPrint()
        throws SQLException {
        DriverManager.registerDriver( new oracle.jdbc.OracleDriver());
        Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:XE", "hr","hr");

        Statement stmt = conn.createStatement();
        ResultSet rset = stmt.executeQuery("(select d.DEPARTMENT_ID, d.DEPARTMENT_NAME, count(*) as num_of_emp , min(salary) as minimum_sal, max(salary) as maximum_sal\n" +
"from departments d, employees e, jobs j\n" +
"where d.DEPARTMENT_ID = e.department_id\n" +
"and j.job_id = e.job_id\n" +
"group by d.DEPARTMENT_NAME, d.DEPARTMENT_ID)\n" +
"union\n" +
"(select d.department_id, department_name,  0 as num_of_emp, 0 as minimum_sal, 0 as maximum_sal\n" +
"from departments d\n" +
"where not exists (select employee_id from employees e, jobs j\n" +
"  where j.job_id = e.job_id\n" +
"  and d.department_id = e.department_id))");

        System.out.printf( "Department ID -" + " Department Name -" + " num_of_emp -" + " minimum_sal -" + " maximum_sal" + "\n");
        while (rset.next())
            System.out.printf("%5d\t%23s\t%8d\t%8d\t%5d\n", rset.getInt("DEPARTMENT_ID"),rset.getString("DEPARTMENT_NAME"),rset.getInt("num_of_emp"),rset.getInt("minimum_sal"),rset.getInt("maximum_sal"));
        rset.close();
        stmt.close();
        conn.close();
     }
}