title: android.database.sqlite.SQLiteException: no such column: aa: , while compiling: Select Name from stud Where Address=aa
body: <p>I'm trying to retrive data from android sqlite database but its givine exception that no such column:
  <hr/>
  <strong>Sqlite Select Query is -:</strong></p>
  
  <pre><code>c=db.rawQuery("Select Name from stud Where Address="+a,null);
  </code></pre>
  
  <p><hr/>
  <strong>Exceptions:-</strong></p>
  
  <pre><code>07-04 18:07:00.888: I/Database(648): sqlite returned: error code = 1, msg = no such column: aa
  07-04 18:07:00.910: D/AndroidRuntime(648): Shutting down VM
  07-04 18:07:00.910: W/dalvikvm(648): threadid=1: thread exiting with uncaught exception (group=0x40015560)
  07-04 18:07:00.948: E/AndroidRuntime(648): FATAL EXCEPTION: main
  07-04 18:07:00.948: E/AndroidRuntime(648): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.my.StudentInfoManagement/com.my.StudentInfoManagement.ListData}: android.database.sqlite.SQLiteException: no such column: aa: , while compiling: Select Name from stud Where Address=aa
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.os.Handler.dispatchMessage(Handler.java:99)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.os.Looper.loop(Looper.java:123)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.app.ActivityThread.main(ActivityThread.java:3683)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at java.lang.reflect.Method.invokeNative(Native Method)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at java.lang.reflect.Method.invoke(Method.java:507)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at dalvik.system.NativeStart.main(Native Method)
  07-04 18:07:00.948: E/AndroidRuntime(648): Caused by: android.database.sqlite.SQLiteException: no such column: aa: , while compiling: Select Name from stud Where Address=aa
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:92)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.database.sqlite.SQLiteCompiledSql.&lt;init&gt;(SQLiteCompiledSql.java:65)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.database.sqlite.SQLiteProgram.&lt;init&gt;(SQLiteProgram.java:83)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.database.sqlite.SQLiteQuery.&lt;init&gt;(SQLiteQuery.java:49)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:42)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1356)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1324)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at com.my.StudentInfoManagement.DataHelper.show(DataHelper.java:86)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at com.my.StudentInfoManagement.ListData.onCreate(ListData.java:19)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
  07-04 18:07:00.948: E/AndroidRuntime(648):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
  07-04 18:07:00.948: E/AndroidRuntime(648):  ... 11 more
  07-04 18:07:03.140: I/Process(648): Sending signal. PID: 648 SIG: 9
  </code></pre>