Question

我有一个Query，它返回了我需要的大部分内容，但我需要一些帮助，我认为是一个WHERE语句。

SELECT
      C.NameOf AS 'Client',
      CV2.DescriptionOf,
      VC.Limit1 AS '1st Limit',
      VC.Limit2 AS '2nd Limit'

FROM Policy AS P 
--And a Bunch of other Joins

WHERE CV2.DescriptionOf IN ('Underinsured/Uninsured Motorists BI', 
    'Bodily Injury Liability','Combined Single Limit Liability',
    'Property Damage - Single Limit')

并返回以下客户信息（显示1个客户端）

Client      DescriptionOf       1stLimit    2ndLimit    
John Doe    Uninsured Motorists 25000       25000       
John Doe    Property Damage     50000               
John Doe    Bodily Injury       25000       25000

我需要的是一个WHERE子句，它将返回描述为“Uninsured Motorists”的行和，1stLimit大于其他2行的1stLimit字段。和2ndLimit字段相同。所以基本上它会返回以下内容......

Client      DescriptionOf       1stLimit    2ndLimit    
John Doe    Uninsured Motorists 25000       25000       
John Doe    Property Damage     50000

有什么想法吗？

Answer 1

好的，我正在修改我的答案，这将看看Uninsured Motorists VC.Limit1是否小于其他任何计划（CV2.DescriptionOf）。注意：这是猜测因为我必须在一堆其他连接部分做出很多假设。

SELECT
  C.NameOf AS 'Client',
  CV2.DescriptionOf,
  VC.Limit1 AS '1st Limit',
  VC.Limit2 AS '2nd Limit'

FROM Policy AS P 
--And a Bunch of other Joins
inner join (select max(VC.Limit1) as MaxLimit, C.NameOf as ClientName 
        from VC --And a Bunch of other Joins
        where CV2.DescriptionOf != 'Uninsured Motorists' 
        group by C.NameOf) m
on m.ClientName = C.NameOf
WHERE CV2.DescriptionOf = 'Uninsured Motorists' 
  and VC.Limit1 < MaxLimit

Answer 2

这可以使用CTE和联合

; with
    CTE as (
        SELECT  C.NameOf AS 'Client',
                CV2.DescriptionOf as 'Description',
                VC.Limit1 AS 'FirstLimit',
                VC.Limit2 AS 'SecondLimit'
            FROM Policy AS P 
            --And a Bunch of other Joins
            WHERE CV2.DescriptionOf IN ('Underinsured/Uninsured Motorists BI', 'Bodily Injury Liability', 'Combined Single Limit Liability', 'Property Damage - Single Limit')
    )
select *
    from CTE p
    where FirstLimit = (
        select MAX(FirstLimit)
            from CTE
            where Client = p.Client
    )
union
select *
    from CTE
    where Description = 'Uninsured Motorists'

SQL查询 - 选择“描述”和“值更大”的位置

2 个答案: