来自其他表的SQL IF条件

Question

我是网站的新手,我需要你们的帮助.以下是我可以在此站点http://sqlfiddle.com/#!3/134c3中运行的架构.我的数据库名称是车辆检查.我的问题是在这个架构之后.

  CREATE TABLE Car  
  ([CarID] varchar(36), 
   [PlateNo] varchar(6),
   [Package] int);   

  INSERT INTO Car([CarID], [PlateNo], [Package])
  VALUES('A57D4151-BD49-4B44-AF10-000F1C298E05', '8112AG', 4);

  CREATE TABLE Event    
  ([EventID] int, 
   [CarID] varchar(36), 
   [EventTime] smalldatetime, 
   TicketStatus varchar (10)) ;    

 INSERT INTO Event([EventID], [CarID], [EventTime], TicketStatus) 
 VALUES (1, 'A57D4151-BD49-4B44-AF10-000F1C298E05', '20130701', 'Open'),  
        (2, 'A57D4151-BD49-4B44-AF10-000F1C298E05', '20130702', 'Close') ; 

 CREATE TABLE EventDefects
  ([EventDefectsID] int, 
   [EventID] int, 
   [Status] varchar(15), 
   [DefectID] int) ; 

 INSERT INTO EventDefects ([EventDefectsID], [EventID], [Status], [DefectID]) 
 VALUES (1, 1, 'YES', 1),
        (2, 1, 'NO', 2),
        (3, 1, 'N/A', 3),
        (4, 1, 'N/A', 4),
        (5, 2, 'N/A', 1),
        (6, 2, 'N/A', 2),
        (7, 2, 'N/A', 5),
        (8, 2, 'YES', 3),
        (9, 2, 'NO', 4) ;

 CREATE TABLE Defects
   ([DefectID] int, 
    [DefectsName] varchar (36), 
    [DefectClassID] int) ; 

 INSERT INTO Defects ([DefectID], [DefectsName], [DefectClassID]) 
 VALUES (1, 'TYRE', 1),
        (2, 'BRAKING SYSTEM', 1),
        (3, 'OVER SPEEDING', 3),
        (4, 'NOT WEARING SEATBELTS', 3),
        (5, 'MIRRORS AND WINDSCREEN', 2) ;

 CREATE TABLE DefectClass
    ([Description] varchar (15), 
     [DefectClassID] int) ; 

 INSERT INTO DefectClass ([DefectClassID], [Description]) 
 VALUES (1, 'CATEGORY A'),
        (2, 'CATEGORY B'),
        (3, 'CATEGORY C') 

澄清事情.我们向驱动程序发出票证有两个条件.

1. 检查车辆时,发现A类或B类任何物品有缺陷(勾选"是").票证状态为OPEN.另一方面,如果A类和B类的所有项目均为"否",则表示未发现任何缺陷.票证状态为CLOSE.最后,C类或(交通违规)下的项目是N/A. 这意味着它仅仅是车辆检查

2. 条件2是由于交通违规而导致车辆停止的地方(例如超速).车辆不会被检查,这张签发车票的区别是A类和B类的所有项目都是刻度或标记为"N/A",而C类则标记为"是"或"否".

现在我有下面的SQL代码可以在上面的模式中使用,它将在其MAX(EventTime)上提取具有相应票证状态的车辆.

  Select 
      PlateNo, TicketStatus, [EventTime] 
  FROM 
      (SELECT 
         ROW_NUMBER() OVER (PARTITION BY Event.CarID ORDER BY [EventTime] DESC) AS [index],
         Event.CarID, 
         TicketStatus, 
         [EventTime],
         plateNo
      FROM 
         [Event] 
      Join 
         [Car] ON Event.CarID = Car.CarID) A 
  WHERE [index] = 1

结果:

RESULT: PlateNo - 8112AG ; EventTime - July 2, 2013; TicketStatus - Close.

这不是正确的,因为在这个特定日期,根本没有检查只有驾驶员因超速而被抓住(参见上面的图示),A类和B类下的项目标记为N/A.

正确的结果应该是2013年7月1日后退一步,票务状态是开放的,因为它是一个明确的检查.检查A类和B类项目,发现TIRES有缺陷,BRAKING SYSTEM没有缺陷.

不知怎的,我正在考虑代码,如果Event.TicketStatus = CLOSE,它将检查它是否接近,因为它被检查或关闭,因为它的交通违规.

Answer 1

尝试这个。

SELECT
  PlateNo,
  TicketStatus,
  MAX(EventTime)
FROM
  [Event] E
LEFT OUTER JOIN
  [EventDefects] ED ON E.EventID = ED.EventID
LEFT OUTER JOIN
  [Defects] D ON ED.DefectID = D.DefectID
LEFT OUTER JOIN 
  [Car] C ON E.CarID = C.CarID
WHERE ED.Status = 'YES' AND D.DefectClassID <> 3
GROUP BY PlateNo, TicketStatus