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Showing content from https://www.tutorialspoint.com/javaexamples/jdbc_edittable.htm below:

How to edit(Add or update) columns of a Table and how to delete a table in Java

How to edit(Add or update) columns of a Table and how to delete a table?

Following example uses create, alter & drop SQL commands to create, edit or delete table.

import java.sql.*;

public class jdbcConn {
   public static void main(String[] args) throws Exception { 
      Class.forName("org.apache.derby.jdbc.ClientDriver");
      Connection con = DriverManager.getConnection(
         "jdbc:derby://localhost:1527/testDb","username", "password");
      
      Statement stmt = con.createStatement();
      String query ="CREATE TABLE employees(id INTEGER PRIMARY KEY, first_name CHAR(50), last_name CHAR(75))";
      
      stmt.execute(query);
      System.out.println("Employee table created");
      String query1 = "aLTER TABLE employees ADD address CHAR(100) ";
      String query2 = "ALTER TABLE employees DROP COLUMN last_name";
      
      stmt.execute(query1);
      stmt.execute(query2);
      System.out.println("Address column added to the table & last_name column removed from the table");
      
      String query3 = "drop table employees";
      stmt.execute(query3);
      System.out.println("Employees table removed");
   }	
}

The above code sample will produce the following result. The result may vary.

Employee table created
Address column added to the table & last_name 
column removed from the table
Employees table removed from the database

java_jdbc.htm

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