Question

我在MySQL中创建物化视图，以便在从一堆其他表（一次一个产品）查询数据时减少服务器负载。我的简化代码如下：

DROP TABLE IF EXISTS `db`.`view_stock`;
CREATE TABLE IF NOT EXISTS `db`.`view_stock` (
SELECT A.title, on_order,(stock-sales) AS 'Stock' FROM
    (SELECT SUM(`bought_products`.`qty`) AS 'on_order'
    ,`bought_products`.product_id, title FROM 
    `bought_products` GROUP BY product_id)
    A, 
    (SELECT SUM(num) AS `stock`,product_id FROM plugins__stock GROUP BY 
    product_id) 
    B,
    (SELECT SUM(`bought_products`.`qty`) AS `sales`
    ,`bought_products`.`product_id` FROM `storage__bought_products` JOIN 
    `plugins__orders` WHERE `bought_products`.`order_id` = 
    `plugins__orders`.`id` AND 
        ((`plugins__orders`.`status` = 'paid') OR
        (`plugins__orders`.`status` = 'shipped'))
    GROUP BY product_id)
    C
WHERE B.product_id = A.product_id AND C.product_id = A.product_id ORDER BY on_order)

当我自己运行查询时，它会工作并按预期返回数据。但是，当我尝试在上面的上下文中创建表时，我收到以下错误：Unrecognized data type. (near 'A')此错误在查询开头突出显示，其中＆＃39; A＆＃39;首先提到（靠近＆＃39; A.title＆＃39;）。

下面是样本结果：

Title        on_order        Stock
'Widget'     6               15
'Gadget'     3               10

我尝试过使用其他方法来声明表格，但似乎没有任何效果。有没有人有任何想法？

bought_products的表格结构为：

CREATE TABLE `bought_products` (
  `id` bigint(20) NOT NULL,
  `order_id` bigint(20) NOT NULL,
  `product_id` bigint(20) NOT NULL,
  `qty` int(11) NOT NULL,
  `stock_count` int(11) NOT NULL,
  `timestamp` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
)

plugins__stock的表格结构为：

CREATE TABLE `plugins__stock` (
  `id` bigint(20) NOT NULL,
  `product_id` bigint(20) NOT NULL,
  `num` int(11) NOT NULL,
  `timestamp` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
)

plugins__orders的表格结构为：

CREATE TABLE `plugins__orders` (
  `id` bigint(20) NOT NULL,
  `name` tinytext NOT NULL,
  ...
  `status` enum('open','paid','shipped','deleted')
)

这些显然缩短了以保持帖子长度短。

MySQL＆＃39;无法识别的数据类型＆＃39;创建表时

0 个答案: