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import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
public class Main {
public static void main(String[] argv) throws Exception {
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/jdbctutorial",
"root", "root");
Statement st = con.createStatement();
int n = st.executeUpdate("ALTER TABLE mytable ADD UNIQUE( colName)");
System.out.println("Query OK, " + n + " rows affected.");
}
}
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