android - Method db.delete some rows? -


I have 4 fields in the table (note 1, note 2, note 3, note 4). I want to delete all the data contained in note 1 and note 2 . I want to add logic to the method db.delete , but I have trouble. 

  Public Zero Deletion () {SQLiteDatabase db = mHelper.getWritableDatabase (); Db.delete (Note: TABLE_NAME, blank, blank); }   
 
 
 Delete always deletes entire rows.  
 In the specific column to clear the value, use an update query, for example  
  ContentValues ​​cv = new ContentValues ​​(); cv.putNull ("Note1"); cv.putNull ("comment2"); Db.update (NoteABABLE.TABLE_NAME, CV, empty, empty);

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