SQLiteException：near＆＃34; u＆＃34;：语法错误（代码1）

Question

我在rawQuery上遇到错误，我试图加入两个表？

 SELECT Calories FROM CalorieIntake_Table c  INNER JOIN Users_Table u ON c.USER_ID = u.U_IDWHERE u.U_ID =?

以下是查询的代码：

 public CalorieIntake getuserIntake(int id) {
    CalorieIntake calorieIntake = null;
    SQLiteDatabase db = getReadableDatabase();
    final String UserintQuery = "SELECT " + KEY_CALORIES + " FROM "
            + TABLE_CALORIE_INTAKE + " c " + " INNER JOIN " + TABLE_USERS + " u " +
            "ON" + " c." + KEY_USER_ID + " = u." + KEY_U_ID + "WHERE u." + KEY_U_ID + " =?";
    Cursor cursor = db.rawQuery(UserintQuery, new String[]{String.valueOf(id)});

    if (cursor != null && cursor.getCount() > 0) {
        cursor.moveToFirst();
        calorieIntake = new CalorieIntake(cursor.getInt(0), cursor.getString(1), cursor.getDouble(2));


    }

    return calorieIntake;
}