单独查询第一个查询中缺少的项目

问题描述 投票：0回答：1

如果客户列表中缺少代码但仍在 WHERE IN 子句中，希望能够使用单独的查询提取代码。因此，对于此查询，我仅适用于客户“测试”时主查询中存在的项目。

如果找不到下面的 WHERE IN 子句中列出的 

itemcode
，我需要它来提取下一个选项 
and [item_or_pricecode] in ('ABC1234','X123456','BR23456','CX23456')
。

如果没有找到 BR23456 的项目代码（我已经从数据中删除以测试这一点），我需要它在这个示例中使用的参数，它需要 blvl = 8 并且客户是“lvlholder”。

由于我的情况，我不确定是否需要在第一个语句周围进行选择

WHERE p.[Customer] ='test'  
  AND p.[itemcode] IN ('ABC1234', 'X123456', 'BR23456', 'CX23456')

仅查找客户“测试”中存在的 

itemcode
。

这是代码

SELECT 
    p.[itemcode],
    p.[uom],
    p.[trtype], 
    p.[alvl],
    p.[blvl],
    CASE 
        WHEN p.[alvl] > 0  
            THEN (SELECT TOP 1 x.start_date FROM pricing x 
                  WHERE x.itemcode = p.itemcode AND x.blvl = p.alvl 
                    AND customer = 'lvlholder' 
                  ORDER BY start_date DESC)
        WHEN p.[trtype] = '' 
            THEN (SELECT TOP 1 x.start_date FROM pricing x 
                  WHERE x.itemcode = p.itemcode AND x.blvl = 8 
                    AND customer = 'lvlholder' 
                  ORDER BY start_date DESC)
        ELSE p.[start_date] 
    END as start_date,
    CASE 
        WHEN p.[trtype] = 'Quot' 
            THEN p.[price]
        WHEN p.[alvl] > 0  
            THEN (SELECT TOP 1 x.price FROM pricing x 
                  WHERE x.itemcode = p.itemcode AND x.blvl = p.alvl 
                    AND customer = 'lvlholder' 
                  ORDER BY start_date DESC)
        WHEN p.[trtype] = '' 
            THEN (SELECT TOP 1 x.price FROM pricing x 
                  WHERE x.itemcode = p.itemcode AND x.blvl = 8 
                    AND customer = 'lvlholder' 
                  ORDER BY start_date DESC)
        ELSE 0
    END AS LevelResult ,
    p.price
FROM 
    pricing p
WHERE 
    p.[Customer] = 'test'  
    AND p.[itemcode] IN ('ABC1234', 'X123456', 'BR23456', 'CX23456')
ORDER BY 
    p.[start_date] DESC

这就是我希望的最终结果

商品代码 乌姆 价格 开始日期 水平结果
ABC1234 EA 0.00 2024 年 1 月 15 日 29.57
X123456 CT 144.10 2024 年 5 月 15 日 144.10
BR23456 电脑 0.00 2024 年 1 月 1 日 15.56
CX23456 PNL 0.00 2024 年 1 月 1 日 15.36

下面是表格及其[示例数据][1]的数据

create table pricing(Customer,itemcode,uom,trtype,Alvl,Blvl,price,start_date)as values
 ('test','ABC1234','EA','',6,0,0.0,'5/27/2024'::date)
,('test','X123456','CT','Quot',0,0,144.1,'5/15/2024')-----------
,('test','CX23456','PNL','',0,0,0,'4/21/2024')
,('lvlholder','ABC1234','EA','',0,3,44.9,'07/11/23')
,('lvlholder','ABC1234','EA','',0,3,44.9,'11/30/2023')
,('lvlholder','ABC1234','EA','',0,5,41.38,'07/11/23')
,('lvlholder','ABC1234','EA','',0,5,41.38,'11/30/2023')
,('lvlholder','ABC1234','EA','',0,2,34.81,'1/15/2024')
,('lvlholder','ABC1234','EA','',0,5,30.49,'1/15/2024')
,('lvlholder','ABC1234','EA','',0,8,28.39,'1/15/2024')
,('lvlholder','ABC1234','EA','',0,2,49.89,'07/11/23')
,('lvlholder','ABC1234','EA','',0,2,49.89,'11/30/2023')
,('lvlholder','ABC1234','EA','',0,7,37.24,'07/11/23')
,('lvlholder','ABC1234','EA','',0,7,37.24,'11/30/2023')
,('lvlholder','ABC1234','EA','',0,4,31.43,'1/15/2024')
,('lvlholder','ABC1234','EA','',0,7,28.97,'1/15/2024')
,('lvlholder','ABC1234','EA','',0,1,62.36,'07/11/23')
,('lvlholder','ABC1234','EA','',0,1,62.36,'11/30/2023')
,('lvlholder','ABC1234','EA','',0,8,36.5,'07/11/23')
,('lvlholder','ABC1234','EA','',0,8,36.5,'11/30/2023')
,('lvlholder','ABC1234','EA','',0,1,38.65,'1/15/2024')
,('lvlholder','ABC1234','EA','',0,3,33.05,'1/15/2024')
,('lvlholder','ABC1234','EA','',0,6,29.57,'1/15/2024')------------
,('lvlholder','ABC1234','EA','',0,4,42.66,'07/11/23')
,('lvlholder','ABC1234','EA','',0,4,42.66,'11/30/2023')
,('lvlholder','ABC1234','EA','',0,6,40.13,'07/11/23')
,('lvlholder','ABC1234','EA','',0,6,40.13,'11/30/2023')
,('lvlholder','X123456','CT','',0,1,251.68,'01/01/53')
,('lvlholder','X123456','CT','',0,2,201.52,'01/01/53')
,('lvlholder','X123456','CT','',0,3,191.4,'01/01/53')
,('lvlholder','X123456','CT','',0,4,181.72,'01/01/53')
,('lvlholder','X123456','CT','',0,5,176.22,'01/01/53')
,('lvlholder','X123456','CT','',0,6,170.94,'01/01/53')
,('lvlholder','X123456','CT','',0,7,165.88,'01/01/53')
,('lvlholder','X123456','CT','',0,8,156.63,'01/01/53')
,('lvlholder','BR23456','PC','',0,5,16.23,'07/05/23')
,('lvlholder','BR23456','PC','',0,5,16.23,'11/30/2023')
,('lvlholder','BR23456','PC','',0,8,14.82,'07/05/23')
,('lvlholder','BR23456','PC','',0,8,14.82,'11/30/2023')
,('lvlholder','BR23456','PC','',0,1,23.51,'07/05/23')
,('lvlholder','BR23456','PC','',0,1,23.51,'11/30/2023')
,('lvlholder','BR23456','PC','',0,3,17.99,'07/05/23')
,('lvlholder','BR23456','PC','',0,3,17.99,'11/30/2023')
,('lvlholder','BR23456','PC','',0,4,17.09,'07/05/23')
,('lvlholder','BR23456','PC','',0,4,17.09,'11/30/2023')
,('lvlholder','BR23456','PC','',0,3,18.89,'01/01/24')
,('lvlholder','BR23456','PC','',0,4,17.94,'01/01/24')
,('lvlholder','BR23456','PC','',0,5,17.04,'01/01/24')
,('lvlholder','BR23456','PC','',0,6,16.54,'01/01/24')
,('lvlholder','BR23456','PC','',0,7,16.04,'01/01/24')
,('lvlholder','BR23456','PC','',0,8,15.56,'01/01/24')--------
,('lvlholder','BR23456','PC','',0,2,19.99,'07/05/23')
,('lvlholder','BR23456','PC','',0,2,19.99,'11/30/2023')
,('lvlholder','BR23456','PC','',0,7,15.28,'07/05/23')
,('lvlholder','BR23456','PC','',0,7,15.28,'11/30/2023')
,('lvlholder','BR23456','PC','',0,1,24.69,'01/01/24')
,('lvlholder','BR23456','PC','',0,2,20.99,'01/01/24')
,('lvlholder','BR23456','PC','',0,6,15.75,'07/05/23')
,('lvlholder','BR23456','PC','',0,6,15.75,'11/30/2023')
,('lvlholder','CX23456','PNL','',0,1,24.38,'01/01/24')
,('lvlholder','CX23456','PNL','',0,2,19.74,'07/05/23')
,('lvlholder','CX23456','PNL','',0,2,19.74,'11/30/2023')
,('lvlholder','CX23456','PNL','',0,5,16.03,'07/05/23')
,('lvlholder','CX23456','PNL','',0,5,16.03,'11/30/2023')
,('lvlholder','CX23456','PNL','',0,7,15.09,'07/05/23')
,('lvlholder','CX23456','PNL','',0,7,15.09,'11/30/2023')
,('lvlholder','CX23456','PNL','',0,2,20.73,'01/01/24')
,('lvlholder','CX23456','PNL','',0,3,18.66,'01/01/24')
,('lvlholder','CX23456','PNL','',0,4,17.72,'01/01/24')
,('lvlholder','CX23456','PNL','',0,5,16.83,'01/01/24')
,('lvlholder','CX23456','PNL','',0,6,16.33,'01/01/24')
,('lvlholder','CX23456','PNL','',0,7,15.84,'01/01/24')
,('lvlholder','CX23456','PNL','',0,8,15.36,'01/01/24')------
,('lvlholder','CX23456','PNL','',0,8,14.63,'07/05/23')
,('lvlholder','CX23456','PNL','',0,8,14.63,'11/30/2023')
,('lvlholder','CX23456','PNL','',0,1,23.22,'07/05/23')
,('lvlholder','CX23456','PNL','',0,1,23.22,'11/30/2023')
,('lvlholder','CX23456','PNL','',0,3,17.77,'07/05/23')
,('lvlholder','CX23456','PNL','',0,3,17.77,'11/30/2023')
,('lvlholder','CX23456','PNL','',0,4,16.88,'07/05/23')
,('lvlholder','CX23456','PNL','',0,4,16.88,'11/30/2023')
,('lvlholder','CX23456','PNL','',0,6,15.55,'07/05/23')
,('lvlholder','CX23456','PNL','',0,6,15.55,'11/30/2023')
;

谢谢

sql subquery
1个回答
0
投票

由于您的之前的问题标记了 SQL Server，我将在这里假设相同。

您无法从 

IN (...)
表达式中提取不匹配的值。您可以将所选的
itemcode
列表定义为单独的源表，或者在
VALUES
子选择中定义，您可以
LEFT JOIN
到您的
prices
表。

原始代码片段：

FROM pricing P
WHERE P.Customer ='test'  
   and P.itemcode in ('ABC1234','X123456','BR23456','CX23456')

然后会变成这样：

FROM (
    VALUES ('ABC1234'), ('X123456'), ('BR23456'), ('CX23456')
) I(itemcode)
LEFT JOIN pricing P
    ON P.Customer = 'test'
    AND P.itemcode = I.itemcode

然后修改查询的其余部分以处理由不匹配的左连接产生的空值。对 

p.itemcode
的引用将更改为 
i.itemcode
。 
ISNULL()
或 
COALESCE()
可用于其他列。

将此应用到我之前基于 

OUTER APPLY
的答案（此处），您将得到：

DECLARE @DefaultCustomerLevel INT = 8 -- This should come from a customer table

SELECT
    I.itemcode,
    COALESCE(PLookup.uom, P.uom) AS uom,
    ISNULL(P.price, 0) AS price,
    COALESCE(PLookup.start_date, P.start_date) AS start_date,
    COALESCE(PLookup.price, P.price) AS LevelResult
FROM (
    VALUES ('ABC1234'), ('X123456'), ('BR23456'), ('CX23456')
) I(itemcode)
LEFT JOIN pricing P
    ON P.Customer = 'test'
    AND P.itemcode = I.itemcode
OUTER APPLY (
    SELECT TOP 1 *
    FROM pricing P1
    WHERE ISNULL(P.trtype, '') = ''
    AND P1.customer = 'lvlholder'
    AND P1.itemcode = I.itemcode  -- Maybe
    AND P1.Blvl = COALESCE(NULLIF(P.Alvl, 0),  @DefaultCustomerLevel)
    --AND P1.start_date <= COALESCE(P.start_date, GETDATE())  -- Maybe
    ORDER BY P1.start_date DESC
) PLookup

结果：

商品代码 乌姆 价格 开始日期 等级结果
ABC1234 EA 0 2024-01-15 29.57
X123456 CT 144.1 2024-05-15 144.1
BR23456 电脑 0 2024-01-01 15.56
CX23456 PNL 0 2024-01-01 15.36

可以对 BartMcEndree 的答案进行类似的修改，但您可能需要在结果中添加另一个子选择。

请参阅 this db<>fiddle 进行演示。

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