SQL運行減法和偏差

Question

-- Just a brief of business scenario is table has been created for a good receipt. 
-- So here we have good expected line with PurchaseOrder(PO) in first few line. 
-- And then we receive each expected line physically and that time these quantity may be different 
-- due to business case like quantity may damage and short quantity like that. 
-- So we maintain a status for that eg: OK, Damage, also we have to calculate short quantity 
-- based on total of expected quantity of each item and total of received line. 


if object_id('DEV..Temp','U') is not null 
drop table Temp 

CREATE TABLE Temp 
(  
ID INT IDENTITY(1,1) PRIMARY KEY CLUSTERED,   
Item VARCHAR(32), 
PO VARCHAR(32) NULL,   
ExpectedQty INT NULL, 
ReceivedQty INT NULL, 
[STATUS] VARCHAR(32) NULL, 
BoxName VARCHAR(32) NULL 
) 


-- Please see first few line with PO data will be the expected lines, 
-- and then rest line will be received line 

INSERT INTO TEMP (Item,PO,ExpectedQty,ReceivedQty,[STATUS],BoxName) 
SELECT 'ITEM01','PO-01','30',NULL,NULL,NULL UNION ALL 
SELECT 'ITEM01','PO-02','20',NULL,NULL,NULL UNION ALL 
SELECT 'ITEM02','PO-01','40',NULL,NULL,NULL UNION ALL 
SELECT 'ITEM03','PO-01','50',NULL,NULL,NULL UNION ALL 
SELECT 'ITEM03','PO-02','30',NULL,NULL,NULL UNION ALL 
SELECT 'ITEM03','PO-03','20',NULL,NULL,NULL UNION ALL 
SELECT 'ITEM04','PO-01','30',NULL,NULL,NULL UNION ALL 
SELECT 'ITEM01',NULL,NULL,'20','OK','box01' UNION ALL 
SELECT 'ITEM01',NULL,NULL,'25','OK','box02' UNION ALL 
SELECT 'ITEM01',NULL,NULL,'5','DAMAGE','box03' UNION ALL 
SELECT 'ITEM02',NULL,NULL,'38','OK','box04' UNION ALL 
SELECT 'ITEM02',NULL,NULL,'2','DAMAGE','box05' UNION ALL 
SELECT 'ITEM03',NULL,NULL,'30','OK','box06' UNION ALL 
SELECT 'ITEM03',NULL,NULL,'30','OK','box07' UNION ALL 
SELECT 'ITEM03',NULL,NULL,'10','DAMAGE','box09' UNION ALL 
SELECT 'ITEM04',NULL,NULL,'25','OK','box10' 



-- Below Table is my expected result based on above data. 
-- I need to show those data following way. 
-- So I appreciate if you can give me an appropriate query for it. 
-- Note: first row is blank and it is actually my table header. :) 
-- Conditions : any of row, we cant have ReceivedQty, DamageQty and ShortQty 
-- values more than ExpectedQty value. Item03 has this scenario 
-- Query should run in SQL 2000 DB 

SELECT ''as'ITEM', ''as'PO#', ''as'ExpectedQty',''as'ReceivedQty',''as'DamageQty' ,''as'ShortQty' UNION ALL 
SELECT 'ITEM01','PO-01','30','30','0' ,'0' UNION ALL 
SELECT 'ITEM01','PO-02','20','15','5' ,'0' UNION ALL 
SELECT 'ITEM02','PO-01','40','38','2' ,'0' UNION ALL 
SELECT 'ITEM03','PO-01','50','50','0' ,'0' UNION ALL 
SELECT 'ITEM03','PO-02','30','20','10' ,'10' UNION ALL 
SELECT 'ITEM03','PO-03','20','0','0','20' UNION ALL 
SELECT 'ITEM04','PO-01','30','25','0' ,'5' 

Answer 1

使用this solution爲出發點，我終於結束了這一點：

SELECT 
    Item, 
    PO, 
    ExpectedQty, 
    ReceivedQty = CASE 
    WHEN RemainderQty >= 0 THEN ExpectedQty 
    WHEN RemainderQty < -ExpectedQty THEN 0 
    ELSE RemainderQty + ExpectedQty 
    END, 
    DamageQty = CASE 
    WHEN RemainderQty >=0 OR ExpectedQty < -TotalRemainderQty THEN 0 
    WHEN RemainderQty < -ExpectedQty AND TotalRemainderQty > 0 THEN ExpectedQty 
    WHEN RemainderQty < -ExpectedQty AND TotalRemainderQty < -DamagedQty THEN ExpectedQty + TotalRemainderQty 
    WHEN RemainderQty > -DamagedQty THEN -RemainderQty 
    ELSE DamagedQty 
    END, 
    ShortQty = CASE 
    WHEN TotalRemainderQty >= 0 THEN 0 
    WHEN TotalRemainderQty < -ExpectedQty THEN ExpectedQty 
    ELSE -TotalRemainderQty 
    END 
FROM (
    SELECT 
    a.Item, 
    a.PO, 
    a.ExpectedQty, 
    b.DamagedQty, 
    RemainderQty = b.ReceivedQty - a.RunningTotalQty, 
    TotalRemainderQty = b.ReceivedQty + b.DamagedQty - a.RunningTotalQty 
    FROM (
    SELECT 
     a.Item, 
     a.PO, 
     a.ExpectedQty, 
     RunningTotalQty = SUM(a2.ExpectedQty) 
    FROM (SELECT Item, PO, ExpectedQty FROM Temp WHERE STATUS IS NULL) AS a 
     INNER JOIN (SELECT Item, PO, ExpectedQty FROM Temp WHERE STATUS IS NULL) AS a2 
     ON a.Item = a2.Item AND a.PO >= a2.PO 
    GROUP BY 
     a.Item, 
     a.PO, 
     a.ExpectedQty 
) a 
    LEFT JOIN (
     SELECT 
     Item, 
     ReceivedQty = SUM(CASE STATUS WHEN 'OK' THEN ReceivedQty ELSE 0 END), 
     DamagedQty = SUM(CASE STATUS WHEN 'DAMAGE' THEN ReceivedQty ELSE 0 END) 
     FROM Temp 
     GROUP BY Item 
    ) b ON a.Item = b.Item 
) s;