mysql查询加入根据折扣百分比计算升级人答案

【问题标题】：mssql query join to work out esclation person based on discounts percentagemysql查询加入根据折扣百分比计算升级人
【发布时间】：2013-06-18 12:42:27
【问题描述】：

您好，我有以下工作查询（mssql）

select 
max(load_number) load_number,max(linediscount) maxlinediscount,max(CustomerBand) customer_band

  from [Linked_Order_lines] 
  join [Customer_Order_Summary]
  on [Customer_Order_Summary].[CustomerOrderID]=[Linked_Order_lines].[load_number]
  join [Customers]
  on Customers.CustomerName=Customer_Order_Summary.CustomerName
  join Customer_Order_lines
  on Customer_Order_Summary.CustomerOrderID=Customer_Order_lines.CustomerOrderID
  join price_escalation_bands
  on price_escalation_bands.band=Customer_Order_Summary.CustomerBand

  where [linked_order_id] in 
  (
    select [linkedorderid] from 
    [Linked_Order_Summary] join [Linked_Order_lines] on
    [Linked_Order_Summary].[linkedorderid] = [Linked_Order_lines].[linked_order_id]
    where [load_number]='7'
  ) 
  and Customer_Order_lines.linestatus='current'

    group by load_number

这会产生结果

在这个查询中，我已经加入了表price_escalation_bands，如下所示：

我想要做的是将查询中的maxlinediscount 与表price_escalation_bands 的discount 列进行比较，并返回表中下一个最大记录的用户ID (fk_salesman_userid)。所以折扣 11 将转到折扣 15 并返回 fk_salesman_userid 9。如果折扣为 18，它将转到 100 并返回 fk_salesman_userid 21。

我基本上是在尝试找出可以批准maxlinediscount 中的折扣的fk_salesman_userid

所以想要的输出是：

我是否需要 case 语句，如果需要，如何将它与现有 select 语句中的 max 语句一起使用？

提前致谢

【问题讨论】：

标签： sql-server join case

【解决方案1】：

在加入 price_escalation_bands 时，您可以使用另外一种条件进行折扣。检查FIDDLE。在这里，我尝试将结果放在临时表中。您可以通过传递max(linediscount) 对join price_escalation_bands 尝试相同的子查询。希望这会对你有所帮助。

【讨论】：

感谢 Pradeeshnarayan，非常感谢。最后，如果没有临时表，我无法完成这项工作。

【解决方案2】：

最终的工作语法：

IF OBJECT_ID('tempdb..#linkloads') IS NOT NULL
BEGIN
DROP TABLE #linkloads
END

CREATE TABLE #linkloads
(
maxlinediscount [decimal](10,3),
customer_band [varchar](50),
load_number [int],
totalcost [decimal](10,3),
period [datetime],
CreditLimit[decimal](10,3),
CurrentBalance[decimal](10,3),
CustomerName [varchar](100),
TotalCubes[decimal](10,3),
TreatedCubes[decimal](10,3),
NormalCubes[decimal](10,3),
PricingIssue[bit]
);



insert into #linkloads

select max(linediscount) maxlinediscount,max(CustomerBand) customer_band,max(load_number) load_number,max(totalcost) totalcost,max(Customer_Order_Summary.PeriodStart) period,max(Customers.CreditLimit) CreditLimit ,max(Customers.CurrentBalance)CurrentBalance,max(Customer_Order_Summary.CustomerName)CustomerName,max(TotalCubes) TotalCubes,max(TreatedCubes)TreatedCubes ,max(TotalCubes-TreatedCubes) as NormalCubes,sum(case when pricingissue=1 THEN 1 ELSE 0 END) pricingissue

  from [Linked_Order_lines] 
  join [Customer_Order_Summary]
  on [Customer_Order_Summary].[CustomerOrderID]=[Linked_Order_lines].[load_number]
  join [Customers]
  on Customers.CustomerName=Customer_Order_Summary.CustomerName
  join Customer_Order_lines
  on Customer_Order_Summary.CustomerOrderID=Customer_Order_lines.CustomerOrderID
   where [linked_order_id] in 
  (
    select [linkedorderid] from 
    [Linked_Order_Summary] join [Linked_Order_lines] on
    [Linked_Order_Summary].[linkedorderid] = [Linked_Order_lines].[linked_order_id]
    where [load_number]='10'
  ) 
  and Customer_Order_lines.linestatus='current'
     group by load_number;

select * from #linkloads;

select load_number,maxlinediscount,customer_band,[Salesman_Discounts_per_band].fk_salesman_userid,totalcost,period,creditlimit,currentbalance,customername,totalcubes,treatedcubes,normalcubes,pricingissue from #linkloads
left outer JOIN [Salesman_Discounts_per_band] on [Salesman_Discounts_per_band].band=#linkloads.customer_band
AND [Salesman_Discounts_per_band].[discount_allowed] = (
  SELECT top 1 [Salesman_Discounts_per_band].[discount_allowed]
  FROM [Salesman_Discounts_per_band]
  WHERE [Salesman_Discounts_per_band].band=#linkloads.customer_band
  AND [Salesman_Discounts_per_band].[discount_allowed]<=#linkloads.maxlinediscount
  ORDER BY [Salesman_Discounts_per_band].[discount_allowed]
)
;

【讨论】：