Question

我需要一些头脑风暴。我建立了一个查询，向我显示了我所需要的。但是，现在的要求是使用此记录列表，并根据特定条件排除记录。

这是我从查询中获得的当前输出：

Patient | Action | Date
james   | REG    | 2019/01/01
James   | CUR    | 2019/01/15
Jacon   | REG    | 2019/01/12
Jacob   | REG    | 2019/01/13
Main    | CUR    | 2019/01/01
Main    | REG    | 2019/01/05
Lucy    | REG    | 2019/01/08
Lucy    | CUR    | 2019/01/09
Lucy    | CUR    | 2019/01/10

基于上面的示例数据，我想删除第一个记录为“ REG”且后续操作为“ CUR”的所有患者。因此，在此示例中，我只想删除James。

关于我应该怎么做的任何想法？

谢谢您的帮助！

Answer 1

您可以使用LEAD函数向前看。

CREATE TABLE #Patients (
    ID int IDENTITY(1,1),
    Patient varchar(50),
    [Action] varchar(50)
);

INSERT INTO #Patients (Patient, [Action])
VALUES
('james', 'REG'),
('James', 'CUR'),
('Jacon', 'REG'),
('Jacob', 'REG'),
('Main',  'CUR'),
('Main',  'REG'),
('Lucy',  'REG'),
('Lucy',  'CUR'),
('Lucy',  'CUR');

SELECT * FROM #Patients;

WITH 
    PatientWithNextAction AS (
        SELECT 
            Patient,
            [Action],
            LEAD([Action]) OVER(PARTITION BY Patient ORDER BY ID) NextAction
        FROM 
            #Patients 
    )
DELETE 
FROM 
    #Patients 
WHERE 
    Patient IN (
        SELECT
            Patient
        FROM
            PatientWithNextAction
        WHERE
            [Action] = 'REG'
            AND NextAction = 'CUR'
    );

SELECT * FROM #Patients;


DROP TABLE #Patients;

Answer 2

请首先使用dense_rank和row_number对数据进行分组，然后再从临时表中受益，获取所需的数据。

CREATE TABLE #temp (Patient VARCHAR(50), Action VARCHAR(3))
Insert INTO #temp VALUES
('james','REG'),
('james','CUR'),
('Jacob','REG'),
('Jacob','REG'),
('Main','CUR'),
('Main','REG'),
('Lucy','REG'),
('Lucy','CUR'),
('Lucy','CUR')

SELECT *, DENSE_RANK() OVER (ORDER BY Patient ASC) GroupNo,
          ROW_NUMBER() OVER (partition BY Patient ORDER BY Patient ASC) GroupOrder
INTO #PatientsWithGroup
FROM #temp

SELECT MIN(c1.GroupNo) GroupNo
INTO #PatsToEliminate
FROM #PatientsWithGroup c1
INNER JOIN #PatientsWithGroup c2 ON c1.GroupNo=c2.GroupNo
WHERE (c1.GroupOrder=1 AND c1.Action='REG') AND (c2.GroupOrder = 2 AND c2.Action='CUR')
HAVING COUNT(c1.Patient)<3

SELECT *
FROM #PatientsWithGroup p
WHERE p.GroupNo NOT IN (SELECT GroupNo FROM #PatsToEliminate)

Answer 3

尝试一下：

 select 1 as ordre, 'james' as Patient, 'REG' as Action into #tmp
union select 2,'James', 'CUR'
union select 3,'Jacon', 'REG'
union select 4,'Jacob', 'REG'
union select 5,'Main' , 'CUR'
union select 6,'Main' , 'REG'
union select 7,'Lucy' , 'REG'
union select 8,'Lucy' , 'CUR'
union select 9,'Lucy' , 'CUR'

;with cte as
(
select ordre, Patient, [Action], RANK () OVER ( 
 PARTITION BY Patient
 ORDER BY  ordre
 ) Patient_order  from #tmp a 
)

select * from cte a where not exists(select 1 from cte b where a.Patient = b.Patient and b.Patient_order = 1 and Action = 'REG'
                            and exists(select 1 from cte c where c.Patient = b.Patient and c.Patient_order = 2 and Action = 'CUR')
                            )

按行排除满足某些条件的记录

3 个答案: