在日期范围内更新价目表中的未结订单

我在以下使用CROSS APPLY的解决方案中使用了 dbfiddler 代码

declare @price_list table(product varchar(20), price int, date_price datetime, base int, active tinyint);
insert into @price_list values
('0125',  90, '2017-01-01', 1200, 0), 
('0125', 100, '2017-01-25', 1000, 1), 
('0125', 110, '2017-02-27', 500,  1),
('1200', 140, '2017-01-01', 2000, 0), 
('1200', 150, '2017-02-01', 1500, 1), 
('1200', 160, '2017-02-27', 1000, 1);

declare @orders table(product varchar(20), order_date datetime, price int, base int);
insert into @orders values
('0125', '2017-02-19', 100, 1000), 
('0125', '2017-02-20', 100, 1000),
('0125', '2017-02-21', 100, 1000), 
('0125', '2017-02-22', 100, 1000),
('0125', '2017-02-23', 100, 1000), 
('0125', '2017-02-28', 110,  500),
('1200', '2017-02-19', 150, 1500), 
('1200', '2017-02-20', 150, 1500),
('1200', '2017-02-21', 150, 1500), 
('1200', '2017-02-22', 150, 1500),
('1200', '2017-02-23', 150, 1500), 
('1200', '2017-02-28', 160, 1000);



declare @new_date_price datetime = '2017-02-21';


-- add a new price to the list
--
insert into @price_list values ('0125', 105, @new_date_price - 1, 1300, 1);
insert into @price_list values ('1200', 155, @new_date_price - 1, 1400, 1);


-- update orders price and base, according products price list date price
--
-- I'd like to avoid use 2 (or more) subqueries
--
UPDATE o
SET o.Price = ca.price
    ,o.base = ca.base
FROM @Orders o
CROSS APPLY (
    SELECT TOP 1 pl.price AS price
        ,pl.base AS base
    FROM @Price_List pl
    WHERE pl.product = o.product
        AND pl.date_price <= o.order_date
        AND active = 1
    ORDER BY pl.date_price DESC
    ) ca
WHERE o.product IN (
        '0125'
        ,'1200'
        );--<<< select distinct product from inserted
-- final result
--
select * from @price_list order by product, date_price;
select * from @orders order by product, order_date;

首先，我要感谢@ScottHodgin 为解决我的问题所做的工作。

尽管他的回答正确地解决了问题，但它更新了特定产品的所有有效订单。我想找到一种解决方案，只更新受新价目表日期影响的订单。

由于此过程是在触发器内执行的，因此我需要生成一个日期间隔列表以与订单日期进行比较。

如果没有下一个 PriceList 记录，我将在“下一个日期”中添加一天，只是为了与<=.

SELECT product, price, date_price, base, active,
       (SELECT TOP 1     pl.date_price
               FROM      PriceList pl
               WHERE     pl.product = i.product
               AND       pl.date_price > i.date_price
               AND       pl.active > 0
               ORDER BY  pl.date_price ASC) next_date
FROM inserted i

一旦解决了日期范围的问题，我只需要更新这个范围内的订单。

WITH PList AS
(
SELECT product, price, date_price, base, active,
       (SELECT TOP 1     pl.date_price
               FROM      PriceList pl
               WHERE     pl.product = i.product
               AND       pl.date_price > i.date_price
               AND       pl.active > 0
               ORDER BY  pl.date_price ASC) next_date
FROM inserted i
)
UPDATE     Orders
SET        price = PList.price,
           base  = PList.base,
           [status] = 'Updated'
FROM       Orders o
INNER JOIN Plist
ON         Plist.product = o.product 
AND        o.order_date >= Plist.date_price
AND        o.order_date < COALESCE(Plist.next_date, DATEADD(DAY, 1, Plist.next_date);

插入两条记录后：

DECLARE @new_date_price datetime = '2017-02-21';

INSERT INTO PriceList VALUES 
('0125', 105, @new_date_price, 1300, 2),
('1200', 155, @new_date_price, 1400, 2);

这是最终结果：

|product|order_date  |price|base|status |
|:------|:-----------|----:|---:|:------|
|0125   |Feb 19 2017 |  100|1000|       |
|0125   |Feb 20 2017 |  100|1000|       |
|0125   |Feb 21 2017 |  105|1300|Updated|
|0125   |Feb 22 2017 |  105|1300|Updated|
|0125   |Feb 23 2017 |  105|1300|Updated|
|0125   |Feb 28 2017 |  110| 500|       |
|1200   |Feb 19 2017 |  150|1500|       |
|1200   |Feb 20 2017 |  150|1500|       |
|1200   |Feb 21 2017 |  155|1400|Updated|
|1200   |Feb 22 2017 |  155|1400|Updated|
|1200   |Feb 23 2017 |  155|1400|Updated|
|1200   |Feb 28 2017 |  160|1000|       |

如果有人感兴趣，我已经设置了一个dbfiddle示例。