T-SQL CASE检查最年轻的日期,然后检查其他值

Question

编辑:重新提出整个问题.第一次带错了方向.

该结果应该是这样的:

MachineName | OrderNo | TaskID | Code | NettoProd | BrutoProd | DiffProd
=========================================================================
F1            123456    101      O      100000      125000      25000
F1            123456    102      P8     1000000     1250000     250000
F1            123456    103      P1     10000       12500       2500
F1            123456    104      P4     100000      125000      25000

在JobSummary下面几列:

StartDate 
TaskID

在Route下面几列:

OrderNo 
TaskID

在Resource保存有关的机器数据

MachineID

如果我首先提供了所有细节,我已经添加了Kyle Gobel的部分,这是正确的答案.

我想要完成的是显示O何时它是第一个taskID链接到一个任务的任务,OrderNo基于该表StartDate,这是DateTime表中的一个字段.

如果这是不可能的同时检查Route.No和JobSummary.StarDate在一个CASE声明中,则两个单独的列会做太多.

询问

SELECT Resource.DESCRIPTION AS MachineName
    ,Route.OrderNo
    ,Route.TaskID
    ,CASE
        WHEN JobSummary.StartDate = (SELECT MIN(cr.StartDate) FROM JobSummary cr) THEN 'O'
        WHEN Route.No = 1 OR Route.No = 2 THEN 'P1'
        WHEN Route.No = 4 THEN 'P4'
        WHEN Route.No >= 8 THEN 'P8'
        ELSE '*FP*'
    END AS Code
    ,JobSummary.GoodProd As NettoProd
    ,JobSummary.GoodProd + JobSummary.SetupProd + JobSummary.WasteProd As BrutoProd
    ,(JobSummary.SetupProd + JobSummary.WasteProd) As DiffProd

FROM Route
JOIN Resource ON Resource.MachineID = Route.MachineID
JOIN JobSummary ON JobSummary.TaskID = Route.TaskID AND JobSummary.MachineID = Route.MachineID

Answer 1

您可以使用ROW_NUMBER()with来根据其PARTITION BY识别第一条记录，如下所示taskIDStartDateOrderNoROW_NUMBER()OVER(PARTITION BY Route.OrderNo ORDER BY JobSummary.StartDate ASC

示例数据和结构

CREATE TABLE [JobSummary] (MachineID INT,TaskID INT,StartDate DATETIME,GoodProd NUMERIC(18,0),SetupProd NUMERIC(18,0),WasteProd NUMERIC(18,0));
CREATE TABLE [Route] (OrderNo INT,MachineID INT,TaskID INT,[No] INT);
CREATE TABLE [Resource] (MachineID INT,DESCRIPTION CHAR(2));


INSERT INTO [Resource] VALUES(1,'F1');

INSERT INTO [Route] VALUES(123456,1,101,1);
INSERT INTO [Route] VALUES(123456,1,102,9);
INSERT INTO [Route] VALUES(123456,1,103,2);
INSERT INTO [Route] VALUES(123456,1,104,4);

INSERT INTO [JobSummary] VALUES(1,101,'20150101',100000,20000,5000);
INSERT INTO [JobSummary] VALUES(1,102,'20150103',1000000,200000,50000);
INSERT INTO [JobSummary] VALUES(1,103,'20150102',10000,2000,500);
INSERT INTO [JobSummary] VALUES(1,104,'20150103',100000,20000,5000);

询问

;WITH CTE AS 
(
SELECT Route.No
    ,Resource.[DESCRIPTION] AS MachineName
    ,Route.OrderNo
    ,Route.TaskID
    ,JobSummary.GoodProd As NettoProd
    ,JobSummary.GoodProd + JobSummary.SetupProd + JobSummary.WasteProd As BrutoProd
    ,(JobSummary.SetupProd + JobSummary.WasteProd) As DiffProd
    ,ROW_NUMBER()OVER(PARTITION BY Route.OrderNo ORDER BY JobSummary.StartDate ASC) rn
FROM Route
JOIN Resource ON Resource.MachineID = Route.MachineID
JOIN JobSummary ON JobSummary.TaskID = Route.TaskID AND JobSummary.MachineID = Route.MachineID
)
SELECT
    MachineName,
    OrderNo,
    TaskID,
    CASE
        WHEN rn = 1 THEN 'O'
        WHEN No IN (1,2) THEN 'P1'
        WHEN No = 4 THEN 'P4'
        WHEN No >= 8 THEN 'P8'
        ELSE '*FP*'
    END AS Code,
    NettoProd,
    BrutoProd,
    DiffProd
FROM CTE
ORDER BY OrderNo,TaskID

输出

MachineName OrderNo TaskID  Code    NettoProd   BrutoProd   DiffProd
F1  123456  101 O   100000  125000  25000
F1  123456  102 P8  1000000 1250000 250000
F1  123456  103 P1  10000   12500   2500
F1  123456  104 P4  100000  125000  25000

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