SQL Max和點心

下面是我查詢我使用：SQL Max和點心

SELECT 
    County, 
    Code, 
    Sum(PaidAmount) AS TotalPaid 
FROM 
    Counties 
GROUP BY 
    County, 
    Code

它返回集合：

County  Code   TotalPaid 
Brown  99   210.21 
Lyon  73   322.22 
Lyon  88   533.22 
Lincoln 22   223.21

我所尋找的是一個查詢，將返回顯示行縣和每個縣的最大總支付代碼。結果集，我需要如下所示的例子（注意里昂，73因爲里昂除去，88具有更高TotalPaid量）：

County  Code   TotalPaid 
Brown  99   210.21 
Lyon  88   533.22 
Lincoln 22   223.21

來源

2011-08-18 Eric R.

什麼數據庫是什麼？ Oracle，SQL Server等？ –

SQL Server 2008 –

我不能對此進行測試，但RANK應該解決這個問題：

SELECT x.County, x.Code x.TotalPaid 
    ,RANK() OVER 
    (PARTITION BY x.County ORDER BY x.TotalPaid DESC) AS 'RANK' 
FROM 

(SELECT 
    County, 
    Code, 
    Sum(PaidAmount) AS TotalPaid 
FROM 
    Counties 
GROUP BY 
    County, 
    Code) x 
WHERE Rank = 1

來源

2011-08-18 19:55:06

Woo !!非常感謝！這就是我需要的樣子！ –

-2

這裏有一個更新的解決方案：

select c1.county, c1.code, c1.paidAmount 
from counties c1 
inner join (
    select county, max(paidAmount) paidAmount 
    from counties 
    group by county) c2 
on c1.county=c2.county and c1.paidAmount=c2.paidAmount;

請注意，如果某個縣的最高支付金額爲多個，則會返回所有共享該最大值的行。

來源

2011-08-18 19:46:24 Briguy37

這會給我每個縣的最大代碼值的總和，這不是我想要的。我想顯示最大TotalPaid行的縣和代碼。 –

@Eric R：對不起，意識到我剛發佈。尋找這樣做的最佳方式... – Briguy37

@Eric R：更新了我的解決方案。 – Briguy37

SELECT 
    c.County, 
    c.Code, 
    Sum(c.PaidAmount) AS TotalPaid 
    FROM 
    Counties c 
    WHERE 
    c.Code in (select max(c2.code) from counties c2 where c2.county = c.county) 
    GROUP BY 
    c.County, 
    c.Code

這個應該工作，雖然我沒有測試過

來源

2011-08-18 19:51:28

他不想要最大代碼值，他希望在每個縣內具有最大「TotalPaid」的代碼。 –

我想你需要做類似的follwoing。在我能夠回顧我所寫的內容之前，我剛剛被叫走，但希望它能給你足夠的指針。有些RDBMS中不允許「其中國家，TotalPaid =選擇價值，價值」的構建，但你可以解決此

select 
    County, 
    Code, 
    TotalPaid 
from (SELECT 
     County, 
     Code, 
     Sum(PaidAmount) AS TotalPaid 
    FROM 
     Counties 
    GROUP BY 
     County, 
     Code) tbl 
where County, TotalPaid = (select County, 
           max(TotalPaid) 
          FROM 
           Counties 
          GROUP BY 
           County, 
           Code) tbl2

來源

2011-08-18 19:51:51 Karl

不知道SQL Server，但在Oracle中，語法是'where（county，totalpaid）IN（select ...）' –

你將不得不使用窗口功能，做到這一點。儘管你想要的東西很容易用英語表達，但不幸的是，它不容易用SQL表達。這應該做你需要的東西：

select 
    County, Code, TotalPaid 
from 
(
SELECT 
    County, 
    Code, 
    sum(PaidAmount) AS TotalPaid 
FROM 
    Counties 
GROUP BY 
    County, Code 
) source 

where (row_number() over (partition by County order by TotalPaid desc)) = 1

來源

2011-08-18 19:53:10

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