MySQL Query在phpmyadmin中运行，但在节点中不运行

Question

我有一个LEFT连接的查询，它在phpmyadmin中工作正常，但同样的查询为节点服务器中的某些行返回null。我是节点和MySQL的新手。

以下是我在日期范围内获取最高销售类别的查询：

SELECT o.order_id,c.category_id,c.category_name as Name, o.book_id, o.date_of_purchase, SUM(o.quantity) as Total, o.payment_method 
FROM `order_details` as o 
LEFT JOIN book as b on b.book_id = o.book_id
LEFT JOIN category as c on c.category_id = b.book_id
 GROUP BY c.category_id 
 ORDER BY Total DESC LIMIT 1

我在这里做错了吗？

以下是我的表格和查询结果：

节点中相同的结果是：

{
    "data": [
        {
            "order_id": 20,
            "category_id": null,
            "Name": null,
            "book_id": 6,
            "date_of_purchase": "2017-07-23T13:22:37.000Z",
            "Total": 55,
            "payment_method": "NB"
        }
    ],
    "status": 1,
    "message": "Success"
}

我调用查询的节点代码：

/ *获得最高销售类别* /

category.getHighestSelling = function(fromDate, toDate) {

    var query = "SELECT min(o.order_id) , c.category_id  , c.category_name as Name  , o.book_id  , min(o.date_of_purchase)  , SUM(o.quantity) as Total  , min(o.payment_method) " +
        "FROM `order_details` as o " +
        "LEFT JOIN book as b on b.book_id = o.book_id " +
        "LEFT JOIN category as c on c.category_id = b.book_id " +
        "GROUP BY c.category_id , o.book_id " +
        "ORDER BY Total DESC LIMIT 1 ";
    if (fromDate && toDate) {
        query += "WHERE `date_of_purchase` BETWEEN '" + dateFormat(fromDate, "yyyy-mm-dd , h:MM:ss ") + "' AND '" + (dateFormat(toDate, "yyyy-mm-dd , h:MM:ss ") || new Date()) + "'";
    }
    return utilities.executeQuery(query);
};