مشکل با پروژه ی ( Android Market ( Local Database

سلام دوستان ، کدها رو مطابق فیلم نوشتم کاملا اجرا می شد برام تا وقتی که خواستم توی لیست ویو باتن های مربوط به فیلتر کردن و سورت کردن رو اضافه کنم . وقتی کدهای مربوطش رو اضافه کردم برنامه crash کرد و علت اصلی رو هم گفته که مربوط میشه به دستور SQL ای که در پارامتر ورودی متد populateFromDatabase تعریف کردم . چه جوری باید باشه مگه ؟ ممنون از همگیییییییییییییی. 

package project;

import android.database.Cursor;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import com.example.n5110.androidmarket.R;
import java.util.ArrayList;


public class ActivityApplicationsList extends ActivityEnhanced {

    private ListView list;
    private AdapterApplication adapter;
    private ArrayList<StructApplication> applications = new ArrayList<StructApplication>();

    private Button btn_all;
    private Button btn_free;
    private Button btn_paid;
    private Button btn_rate;
    private Button btn_price;
    private Button btn_installs;
    private String lastSort = "app ratingValue DESC";
    private String lastFilter = "1=1";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_applications_list);

        list = (ListView)findViewById(R.id.list);
        btn_all = (Button)findViewById(R.id.btn_all);
        btn_free = (Button)findViewById(R.id.btn_free);
        btn_paid = (Button)findViewById(R.id.btn_paid);
        btn_rate = (Button)findViewById(R.id.btn_rate);
        btn_price = (Button)findViewById(R.id.btn_price);
        btn_installs = (Button)findViewById(R.id.btn_installs);


        btn_all.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                lastFilter = "1=1";
                populateFromDatabase();
            }
        });

        btn_free.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                lastFilter = "app_price = 0";
                populateFromDatabase();
            }
        });

        btn_paid.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                lastFilter = "app_price > 0";
                populateFromDatabase();
            }
        });

        btn_rate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                lastSort = "app_ratingValue DESC";
                populateFromDatabase();

            }
        });

        btn_price.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                lastSort = "app_price ASC";
                populateFromDatabase();
            }
        });

        btn_installs.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                lastSort = "app_installs DESC";
                populateFromDatabase();
            }
        });

        adapter = new AdapterApplication(this, applications);
        list.setAdapter(adapter);

        populateFromDatabase();
    }

    private void populateFromDatabase(){
        applications.clear();
        Cursor cursor = G.database.rawQuery("SELECT * FROM app WHERE " + lastFilter + " ORDER BY " + lastSort, null);
        while (cursor.moveToNext()){
            applications.add(new StructApplication(cursor.getString(cursor.getColumnIndex("app_name")) ,
                    cursor.getInt(cursor.getColumnIndex("app_price")),
                    "",
                    cursor.getFloat(cursor.getColumnIndex("app_ratingValue")),
                    cursor.getString(cursor.getColumnIndex("app_author")) ,
                    cursor.getInt(cursor.getColumnIndex("app_votes")),
                    cursor.getLong(cursor.getColumnIndex("app_fileSize")),
                    cursor.getString(cursor.getColumnIndex("app_versionName")),
                    cursor.getInt(cursor.getColumnIndex("app_installs")),
                    cursor.getString(cursor.getColumnIndex("app_description")),
                    cursor.getString(cursor.getColumnIndex("app_phoneNumber")),
                    cursor.getString(cursor.getColumnIndex("app_email"))
            ));
        }
        cursor.close();
        adapter.notifyDataSetChanged();
    }
}

// Errors : 

10332-10332/com.example.n5110.androidmarket E/AndroidRuntime: FATAL EXCEPTION: main
 Process: com.example.n5110.androidmarket, PID: 10332
 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.n5110.androidmarket
/project.ActivityApplicationsList}: android.database.sqlite.SQLiteException: 
near "ratingValue": syntax error (code 1): , while compiling:
 SELECT * FROM app WHERE 1=1 ORDER BY app ratingValue DESC
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
 at android.app.ActivityThread.access$800(ActivityThread.java:151)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
 at android.os.Handler.dispatchMessage(Handler.java:102)
 at android.os.Looper.loop(Looper.java:135)
 at android.app.ActivityThread.main(ActivityThread.java:5254)
 at java.lang.reflect.Method.invoke(Native Method)
 at java.lang.reflect.Method.invoke(Method.java:372)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
 Caused by: android.database.sqlite.SQLiteException: near "ratingValue": syntax error (code 1): , while compiling: SELECT * FROM app WHERE 1=1 ORDER BY app ratingValue DESC
 at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
 at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
 at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
 at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
 at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
 at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
 at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
 at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1316)
 at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1255)
 at project.ActivityApplicationsList.populateFromDatabase(ActivityApplicationsList.java:100)
 at project.ActivityApplicationsList.onCreate(ActivityApplicationsList.java:95)
 at android.app.Activity.performCreate(Activity.java:5990)
 at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) 
 at android.app.ActivityThread.access$800(ActivityThread.java:151) 
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
 at android.os.Handler.dispatchMessage(Handler.java:102) 
 at android.os.Looper.loop(Looper.java:135) 
 at android.app.ActivityThread.main(ActivityThread.java:5254) 
 at java.lang.reflect.Method.invoke(Native Method) 
 at java.lang.reflect.Method.invoke(Method.java:372) 
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)