How to display all data from sqlite database

I'm making an app that will let users add their school subjects. Before i continue let me give you my code:

MainActivity:

    package cannon.gaming.mymarks;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.text.Html;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;


public class MainActivity extends ActionBarActivity {
    TextView textSubject;
    String SUBJECT, PASS;
    Context ctx =  this;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getSupportActionBar().hide();
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_main);

        /*Button buttonAdd = (Button) findViewById(R.id.buttonAdd);
        buttonAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(v.getContext(), RegisterActivity.class);
                intent.setFlags(intent.FLAG_ACTIVITY_CLEAR_TOP);
                intent.putExtra("EXIT", true);
                startActivityForResult(intent, 0);
            }
        });*/

        Button buttonAdd = (Button) findViewById(R.id.buttonAdd);
        textSubject = (TextView) findViewById(R.id.textSubject);
        buttonAdd.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                showInputDialog();
            }
        });
    }

    protected void showInputDialog() {

        // get prompts.xml view
        LayoutInflater layoutInflater = LayoutInflater.from(MainActivity.this);
        View promptView = layoutInflater.inflate(R.layout.activity_dialog, null);
        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);
        alertDialogBuilder.setView(promptView);

        final EditText editText = (EditText) promptView.findViewById(R.id.edittext);
        // setup a dialog window
        alertDialogBuilder.setCancelable(false)
                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        SUBJECT = editText.getText().toString();
                        PASS = "0";
                        DatabaseOperations DB = new DatabaseOperations(ctx);
                        DB.putInformation(DB, SUBJECT, PASS);
                        Toast.makeText(getBaseContext(), "Subject added", Toast.LENGTH_SHORT).show();
                        finish();
                    }
                })
                .setNegativeButton("Cancel",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int id) {
                                dialog.cancel();
                            }
                        });

        // create an alert dialog
        AlertDialog alert = alertDialogBuilder.create();
        alert.show();
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

TableData:

package cannon.gaming.mymarks;

import android.provider.BaseColumns;

/**
 * Created by Asuspc on 01/07/2015.
 */
public class TableData {

    public TableData()
    {

    }

    public static abstract class TableInfo implements BaseColumns
    {
        public static final String USER_NAME = "user_name";
        public static final String USER_PASS = "user_pass";
        public static final String DATABASE_NAME = "user_info";
        public static final String TABLE_NAME = "reg_info";
    }

}

DatabaseOperations:

package cannon.gaming.mymarks;


import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

/**
 * Created by Asuspc on 01/07/2015.
 */
public class DatabaseOperations extends SQLiteOpenHelper {
    public static final int database_version = 1;
    public String CREATE_QUERY = "CREATE TABLE "+ TableData.TableInfo.TABLE_NAME+"("+ TableData.TableInfo.USER_NAME+" TEXT,"+ TableData.TableInfo.USER_PASS+" TEXT);";
    public DatabaseOperations(Context context) {
        super(context, TableData.TableInfo.DATABASE_NAME, null, database_version);
        Log.d("Database Operations", "Database created");
    }

    @Override
    public void onCreate(SQLiteDatabase sdb)
    {
        sdb.execSQL(CREATE_QUERY);
        Log.d("Database Operations", "Table created");
    }
    @Override
    public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2)
    {

    }
    public void putInformation(DatabaseOperations dop,String name, String pass)
    {
        SQLiteDatabase SQ = dop.getWritableDatabase();
        ContentValues cv = new ContentValues();
        cv.put(TableData.TableInfo.USER_NAME, name);
        cv.put(TableData.TableInfo.USER_PASS, pass);
        long k = SQ.insert(TableData.TableInfo.TABLE_NAME, null, cv);
        Log.d("Database Operations", "One row inserted");
    }
    public Cursor getInformation(DatabaseOperations dop)
    {
        SQLiteDatabase SQ = dop.getReadableDatabase();
        String[] columns = {TableData.TableInfo.USER_NAME, TableData.TableInfo.USER_PASS};
        Cursor CR = SQ.query(TableData.TableInfo.TABLE_NAME, columns, null, null, null, null, null);
        return CR;
    }
}

Now let me explain. When i press the "buttonAdd" button it will let me enter the subject name obviously, and save it in database. But what i can't make is, i want to display all database on MainActivity. And it should be like this: Names of subjects on the left side, average of those subjects on the right side (the string PASS should be that average, that's why it is 0 when you first add the subject). And i want to make each of those subjects clickable, so when you click it it should show you all marks from that subject and let you add or remove them. Now, i guess, displaying data shouldn't be so hard, but still i need your help. But making each subject clickable i really have no idea how. And each subject having it's own marks, i don't know, does it mean new activity for every new subject or new database or what? Please help, i can't do this on my own. I hope that I explained everything properely and that you understand me. Thanks in advance!