Question

此查询的目标是使用与CountryCode和ProductCode匹配的Table2中的最高和最低价格来更新表1中的MinPrice和MaxPrice列。

当我运行此查询时，表1中的Max和Minprice的整个列将填充来自select查询的第一个值。

如果我自己运行选择查询，则会显示每个产品每个国家/地区的正确最小值和最大值。

   UPDATE Table1
        SET MinPrice = MinOfPrice, Maxprice = MaxOfPrice
        FROM (SELECT Min(lp.Price) AS MinOfPrice, Max(lp.Price) AS MaxOfPrice 
        FROM Table2 lp INNER JOIN Table1 d ON lp.CountryCode = d.CountryCode AND 
        lp.ProductCode = d.ProductCode
        GROUP BY lp.CountryCode, lp.ProductCode, lp.PriceOriginTypeCode) h ;

Answer 1

我认为这将是您的解决方案，或者几乎与您的解决方案类似。

    UPDATE Table1 
            SET table1.MinPrice = lp.MinOfPrice, table1.Maxprice = lp.MaxOfPrice
            FROM Table1 INNER JOIN ( SELECT top 100 percent  CountryCode, ProductCode, MAX(Price) as MaxOfPrice, MIN(Price) as MinOfPrice FROM Table1 group by  CountryCode, ProductCode) as lp ON lp.CountryCode = Table1.CountryCode AND 
            lp.ProductCode = Table1.ProductCode

Answer 2

只解释我的评论

UPDATE Table1
        SET MinPrice = MinOfPrice, Maxprice = MaxOfPrice
FROM (SELECT Min(lp.Price) AS MinOfPrice, Max(lp.Price) AS MaxOfPrice, lp.CountryCode,lp.ProductCode
        FROM Table2 lp INNER JOIN Table1 d ON lp.CountryCode = d.CountryCode AND 
        lp.ProductCode = d.ProductCode
        GROUP BY lp.CountryCode, lp.ProductCode, lp.PriceOriginTypeCode) h join Table1 on Table1.ProductCode=h.ProductCode and Table1.CountryCode=h.CountryCode

Answer 3

我想您当前的查询正在修改table1的每条记录的最小值和最大值，请尝试通过通用列更新以下内容

   UPDATE Table1
    SET MinPrice = MinOfPrice, Maxprice 
   = MaxOfPrice
      FROM (SELECT Min(lp.Price) AS 
      MinOfPrice, Max(lp.Price) AS 
     MaxOfPrice 
    FROM Table 2 lp INNER JOIN Table1 d 
   ON lp.CountryCode = d.CountryCode 
  AND 
      lp.ProductCode = d.ProductCode
    GROUP BY lp.CountryCode, 
    lp.ProductCode, 
    lp.PriceOriginTypeCode) h
      where h.some_common_column =
             Table1.common_column
        -- make this query as corelated via above where clause

Answer 4

您应该在子查询中获取汇总值，然后进行联接。像这样：

update t1
set t1.minPrice = t2.minPrice
    ,t1.maxPrice = t2.maxPrice
from table1 t1
         inner join (
                    select min(price) minPrice
                          ,max(price) maxPrice
                          ,productCode
                          ,countryCode
                    from table2
                    group by productCode
                             ,countryCode
                     ) t2 on t2.productCode = t.productCode
                           and t2.countryCode = t.countryCode

Answer 5

尝试一下：

UPDATE Table1
SET MinPrice = h.MinOfPrice
,Maxprice = h.MaxOfPrice
FROM (
      SELECT d.CountryCode, d.ProductCode,
             Min(lp.Price) AS MinOfPrice,
             Max(lp.Price) AS MaxOfPrice 
      FROM Table 2 lp 
      INNER JOIN Table1 d 
         ON lp.CountryCode = d.CountryCode
         AND lp.ProductCode = d.ProductCode
      GROUP BY d.CountryCode, d.ProductCode
) h ;

我已经摆脱了lp.PriceOriginTypeCode，因为我也不知道这是否也是TABLE1的一部分

Answer 6

您必须将Table1带出子查询。而且我不明白为什么要按三列分组-这样一来，一个CountryCode-ProductCode组合可以有几行。

UPDATE t
SET MinPrice = h.MinOfPrice, Maxprice = h.MaxOfPrice
FROM Table1 t
    JOIN (
        SELECT  lp.CountryCode,
             lp.ProductCode,
             Min(lp.Price) AS MinOfPrice,
             Max(lp.Price) AS MaxOfPrice 
        FROM Table2 lp
        GROUP BY lp.CountryCode, lp.ProductCode
        , lp.PriceOriginTypeCode -- why do you also group by this column?
    ) h ON h.CountryCode = t.CountryCode AND h.ProductCode = t.ProductCode;

使用来自选择查询的数据更新表，包括第二个表

6 个答案: