Question

我需要识别具有多个相同IncidentCode的所有StudentID，但仅当IncidentID也是＆gt;我该怎么办？

数据集：

期望的结果：

示例数据集代码：

CREATE TABLE #Duplicates(
IncidentID varchar(10),
StudentID varchar(10),
IncidentCode varchar(10),
Levels varchar(10)
)
INSERT into #Duplicates (IncidentID, StudentID, IncidentCode, Levels)
VALUES 
('1', '4444444','06','1'),
('1', '4444444','06','2'),
('23', '5555555','06','1'),
('22', '3333333','06','2'),
('64', '3333333','06','2'),
('64', '3333333','06','3')

SELECT * 
FROM #Duplicates

谢谢！

Answer 1

SELECT Distinct * 
FROM #Duplicates
Where IncidentID in (Select IncidentID from #Duplicates Group By IncidentID  having count(*)>1)

返回

IncidentID  StudentID   IncidentCode    Levels
1           4444444     06              1
1           4444444     06              2
64          3333333     06              2
64          3333333     06              3

Answer 2

您也可以使用连接：如果您处理大量数据，它将帮助您提高性能

SELECT * 
FROM #Duplicates a 
INNER JOIN (SELECT incidentID FROM #Duplicates b 
GROUP BY incidentID HAVING COUNT(incidentCode)>1) b ON a.IncidentID = b.IncidentID

Answer 3

您可以使用此类查询

;WITH cte
AS (SELECT
    *,
    ROW_NUMBER() OVER (PARTITION BY studentid ORDER BY incidentcode) AS rn
FROM #Duplicates
WHERE IncidentID > 1)
SELECT DISTINCT
    StudentId
FROM cte

Answer 4

let refer = FIRDatabase.database().reference().child("UserDevices")

var globalEmail : String!
var globalPhone : String!
var globalImageUrl: String!


override func viewWillAppear(_ animated : Bool){
    super.viewWillAppear(animated)
    retrieveUserData{(email,phone,ImageUrl) in
        self.globalEmail = email
        self.globalPhone = phone
        self.globalImageUrl = ImageUrl
    }

}

func retrieveUserData(_ completionBlock : @escaping ((_ email : String?, _ phone : String?, _ ImageUrl: String?)->Void)){
    refer.child(byAppendingPath: self.strUserid as String).observe(.value , with: {snapshot in
        if let userDict =  snapshot.value as? [String:AnyObject]  {
            completionBlock(userDict["email"] as! String, userDict["phone"] as! String, userDict["ImageUrl"] as! String)
        }
    })
}

var strUserid : NSString!
override func viewDidLoad() {
    super.viewDidLoad()

    print(globalEmail)
    print(globalImageUrl)
    print(globalPhone)

    self.navigationController?.navigationBar.tintColor = UIColor.white

    print("idis \(self.strUserid)")

     let ref = FIRDatabase.database().reference().child("UserDevices")

     self.navigationController?.navigationBar.tintColor = UIColor.white
    ref.child(byAppendingPath: self.strUserid as String).observe(.value, with: { snapshot in

        if let dict = snapshot.value as? NSMutableDictionary{

            print("dict is \(dict)")

            if let Provider = dict["name"] as? String
            {
                self.DeviceDetailsProvider.text = Provider
               // self.navigationItem.title = Provider
            }
            if let name = dict["DeviceName"] as? String
            {
                self.DeviceDetailsName.text = name
                self.navigationItem.title = name
            }
            if let ShortDescription = dict["Description"] as? String
            {
                self.DeviceDetailsDescription.text = ShortDescription
            }
            if let City = dict["city"] as? String
            {
                self.DeviceDetailsCity.text = City
            }

        }
    })


   self.DeviceDetailsImageView.downloadedFrom(link: globalImageUrl)

}

您如何根据计算两个标准来确定结果？

4 个答案: