Sql query with an conditional column

Hello ,
Need help in this query, please see the excel sheet for the expected result.

;WITH Drivers
AS ( SELECT   J.DriverID ,
              MAX(J.CollectionDatetime) AS LastAllocStDate
     FROM     Table_JOB J
     GROUP BY J.DriverID ) ,
     A
AS ( SELECT j.ID ,
            j.ClientName ,
            j.DriverID ,
            CAST(j.CollectionDateTime AS DATE) AS AllocStDate ,
            j.Allocation ,
            CAST(j.AllocEndDate AS DATE) AS AllocEndDate
     FROM  Table_JOB j
            INNER JOIN Drivers d ON j.driverId = d.driverId
                                    AND j.CollectionDatetime = d.LastAllocStDate ) ,
     T
AS ( SELECT B.NAME ,
            A.Allocation ,
            A.AllocStDate ,
            A.AllocEndDate ,
            A.ClientName ,
            A.ID ,
            IIF(A.AllocStDate <= CAST(GETDATE() AS DATE) AND A.AllocEndDate >= CAST(GETDATE() AS DATE), 'Allocated', NULL) AS OnJob
     FROM   A
            INNER JOIN FieldResource B ON A.DriverID = B.ID ) ,
     Z
AS ( SELECT DISTINCT T.Name ,
            T.Allocation ,
            T.AllocStDate ,
            T.AllocEndDate ,
            IIF(T.OnJob IS NULL, NULL, T.ClientName) AS ClientName ,
            IIF(T.OnJob IS NULL, NULL, T.ID) AS ID ,
            IIF(T.OnJob IS NULL, 'YES', NULL) AS NotAllocated ,
            T.OnJob AS Allocated
     FROM   T )
,CTE1 AS
(
	SELECT   
			 Z.Name ,
			 Z.Allocation, 
			  Z.Allocated ,
			 Z.AllocStDate ,
			 Z.AllocEndDate ,
			 Z.ClientName ,
			 Z.ID ,
			 Z.NotAllocated ,					 	          
			 IIF( 1=1  
			 AND EXISTS ( SELECT * FROM Transfer TT WHERE TT.Driver = Z.Name AND TT.Comments = 'Allocated' )
			 , 'Allocated', '') AS IsAllocatedByTransferTab
	FROM     Z
			 
)
,CTE2 AS
(
	SELECT u.Name,u.Allocation,u.AllocStDate,u.AllocEndDate	, u.ClientName ,u.ID,u.NotAllocated,
	CASE WHEN u.NotAllocated IS NULL THEN 'Yes' ELSE u.Allocated END Allocated
	,u.IsAllocatedByTransferTab, u.Comments
	FROM 
	(
		SELECT Z.Name,	Z.Allocation ,Z.allocated 	,  TT.Comments, TT.Principal,
		CASE WHEN  TT.Comments = 'Transfer'  or  TT.Comments = 'Allocated'  or  TT.Comments = 'AllocationChanged'THEN TT.TrDate ELSE Z.AllocStDate END AllocStDate
		 ,	Z.AllocEndDate	, Z.ClientName ,	Z.ID , 
		 CASE WHEN TT.Comments = 'Allocated' THEN NULL ELSE Z.NotAllocated END	NotAllocated 
		, CASE WHEN  TT.Comments = 'Transfer'  or  TT.Comments = 'Allocated'  or  TT.Comments = 'AllocationChanged' THEN TT.Comments
		ELSE Z.IsAllocatedByTransferTab END IsAllocatedByTransferTab
		,COUNT(*) OVER (PARTITION BY Z.Name ORDER BY CASE 
		WHEN  TT.Comments = 'Transfer'  or  TT.Comments = 'Allocated'  or  TT.Comments = 'AllocationChanged' THEN TT.TrDate ELSE Z.AllocStDate END DESC) rnk 
		FROM CTE1 Z
		LEFT JOIN [Transfer] TT ON TT.Driver = Z.Name 
	)u WHERE u.rnk = 1 
)
SELECT Name	,Allocation,	AllocStDate,	AllocEndDate	,ClientName	
,ID
,IIF (  AllocEndDate < GETDATE() , 'Yes' , NotAllocated  ) NotAllocated
,IIF ( AllocStDate > AllocEndDate AND Comments='Allocated' , 'Yes'   , Allocated  ) Allocated
,case when AllocStDate > AllocEndDate AND Comments='Allocated' then 'Allocated' else  
 IIF ( AllocEndDate < GETDATE() , NULL , IsAllocatedByTransferTab ) 
 end IsAllocatedByTransferTab
FROM CTE2
order by notallocated asc

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ExpectedResult7.xlsx
RIASAsked:
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AndyAinscowFreelance programmer / ConsultantCommented:
I would suggest you actually tell us what is wrong with your current query IN WORDS.  Also supply starting data.
I'm not going to waste my time trying to work out what it is you want to correct.
0
RIASAuthor Commented:
Andy, please refer my worksheet.
If it is still not clear please let me know
0
Ganesh GuruduSenior ConsultantCommented:
try this code.

;WITH Drivers
AS ( SELECT   J.DriverID ,
              MAX(J.CollectionDatetime) AS LastAllocStDate
     FROM     Table_JOB J
     GROUP BY J.DriverID ) ,
     A
AS ( SELECT j.ID ,
            j.ClientName ,
            j.DriverID ,
            CAST(j.CollectionDateTime AS DATE) AS AllocStDate ,
            j.Allocation ,
            CAST(j.AllocEndDate AS DATE) AS AllocEndDate
     FROM  Table_JOB j
            INNER JOIN Drivers d ON j.driverId = d.driverId
                                    AND j.CollectionDatetime = d.LastAllocStDate ) ,
     T
AS ( SELECT B.NAME ,
            A.Allocation ,
            A.AllocStDate ,
            A.AllocEndDate ,
            A.ClientName ,
            A.ID ,
            IIF(A.AllocStDate <= CAST(GETDATE() AS DATE) AND A.AllocEndDate >= CAST(GETDATE() AS DATE), 'Allocated', NULL) AS OnJob
     FROM   A
            INNER JOIN FieldResource B ON A.DriverID = B.ID ) ,
     Z
AS ( SELECT DISTINCT T.Name ,
            T.Allocation ,
            T.AllocStDate ,
            T.AllocEndDate ,
            IIF(T.OnJob IS NULL, NULL, T.ClientName) AS ClientName ,
            IIF(T.OnJob IS NULL, NULL, T.ID) AS ID ,
            IIF(T.OnJob IS NULL, 'YES', NULL) AS NotAllocated ,
            T.OnJob AS Allocated
     FROM   T )
,CTE1 AS
(
	SELECT   
			 Z.Name ,
			 Z.Allocation, 
			  Z.Allocated ,
			 Z.AllocStDate ,
			 Z.AllocEndDate ,
			 Z.ClientName ,
			 Z.ID ,
			 Z.NotAllocated ,					 	          
			 IIF( 1=1  
			 AND EXISTS ( SELECT * FROM Transfer TT WHERE TT.Driver = Z.Name AND TT.Comments = 'Allocated' )
			 , 'Allocated', '') AS IsAllocatedByTransferTab
	FROM     Z
			 
)
,CTE2 AS
(
	SELECT u.Name,u.Allocation,u.AllocStDate,u.AllocEndDate	, u.ClientName ,u.ID,u.NotAllocated,
	CASE WHEN u.NotAllocated IS NULL THEN 'Yes' ELSE u.Allocated END Allocated
	,u.IsAllocatedByTransferTab, u.Comments,u.Principal
	FROM 
	(
		SELECT Z.Name,	Z.Allocation ,Z.allocated 	,  TT.Comments, TT.Principal,
		CASE WHEN  TT.Comments = 'Transfer'  or  TT.Comments = 'Allocated'  or  TT.Comments = 'AllocationChanged'THEN TT.TrDate ELSE Z.AllocStDate END AllocStDate
		 ,	Z.AllocEndDate	, Z.ClientName ,	Z.ID , 
		 CASE WHEN TT.Comments = 'Allocated' THEN NULL ELSE Z.NotAllocated END	NotAllocated 
		, CASE WHEN  TT.Comments = 'Transfer'  or  TT.Comments = 'Allocated'  or  TT.Comments = 'AllocationChanged' THEN TT.Comments
		ELSE Z.IsAllocatedByTransferTab END IsAllocatedByTransferTab
		,COUNT(*) OVER (PARTITION BY Z.Name ORDER BY CASE 
		WHEN  TT.Comments = 'Transfer'  or  TT.Comments = 'Allocated'  or  TT.Comments = 'AllocationChanged' THEN TT.TrDate ELSE Z.AllocStDate END DESC) rnk 
		FROM CTE1 Z
		LEFT JOIN [Transfer] TT ON TT.Driver = Z.Name 
	)u WHERE u.rnk = 1 
)
SELECT Name	,Allocation,	AllocStDate,	AllocEndDate	,  CASE WHEN Comments = 'Allocated' THEN Principal ELSE ClientName END  ClientName	
,ID
,IIF (  AllocEndDate < GETDATE() , 'Yes' , NotAllocated  ) NotAllocated
,IIF ( AllocStDate > AllocEndDate AND Comments='Allocated' , 'Yes'   , Allocated  ) Allocated
,case when AllocStDate > AllocEndDate AND Comments='Allocated' then 'Allocated' else   IIF ( AllocEndDate < GETDATE() , NULL , IsAllocatedByTransferTab ) 
 end IsAllocatedByTransferTab
FROM CTE2
order by notallocated asc

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RIASAuthor Commented:
Thanks Ganesh! will try and brb
0
RIASAuthor Commented:
Ganesh , Workd liked charm mate.I was struggling with this for ages.Can't thank you enough!
1
RIASAuthor Commented:
Thanks!!!
1
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