Natural Join / joining two tables
A join provide the facility to merge two tables according to common field and Create a new virtual field. We will use the following query-
A join provide the facility to merge two tables according to common field and Create a new virtual field. We will use the following query-Natural Join / joining two tables
A join provide the facility to merge two tables according to common field and Create a new virtual field. We will use the following query-
| SELECT * FROM employee NATURAL JOIN emp_sal |
Here, "NATURAL JOIN" join the two table according to common field and store it in "Statement " class object.
The two tables before join --
"employee" table
"emp_sal" table
NatJoin.java
import java.sql.*;
public class NatJoin{
public static void main(String[] args) {
System.out.println("Table after Natural Join");
Connection con = null;
try{
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://192.168.10.13:3306/ankdb","root","root");
try{
Statement st = con.createStatement();
//Join two tables
ResultSet res = st.executeQuery("SELECT *FROM "+"employee"+" NATURAL JOIN "+"emp_sal");
System.out.println("Emp_code" + "\t" + "Emp_name" + "\t" + "Emp_salary"+"\t"+"Emp_designation";
while(res.next()){
int code = res.getInt("Emp_code");
String name = res.getString("Emp_name");
String sal = res.getString("Emp_salary");
String post = res.getString("Emp_designation");
System.out.println(code + "\t\t" + name + "\t\t" + sal+"\t\t"+post);
}
}
catch (SQLException s){
System.out.println("Error in excution of SQL statement");
}
}
catch (Exception e){
e.printStackTrace();
}
}
}
OUTPUT
