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Home » SQL Server 2012 » SQL Server 2012 - T-SQL » computed column in view
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ohpenot
Posted Thursday, February 21, 2013 8:24 AM
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I have the following "create view" query that s not working, can't figure out what's wrong... :

use test1
go

create view dbo.GlobaldataEOLT2

as

select [NUMCAM]
,[C_Fourn]
,[date_passage]
,[heure_passage]
,[banc]
,[NUMPale]
,[Module_Status]
,[Code_defaut]
,[Total_TestTime]
,[Purgerunin_TestTime]
,[ShifterPosHyst_TestTime]
,[ShifterActRespTime_TestTime]
,[GearActStroke_TestTime]
,[GearActRespTime_TestTime]
,[LeakageON_TestTime]
,[K1K2Leakage_TestTime]
,[QPVK1DeliveryTest_TestTime]
,[PPVK2PressureTest_TestTime]
,[LeakageOFF_TestTime]
,[PRVTest_TestTime]
,[OPS_NRV_Test_TestTime]
,[version_prog]
,[Jourprod] AS
CASE WHEN heure_passage BETWEEN '00:00:00' and '05:59:59' THEN day(jour_passage) -2
ELSE day([date_passage]) -1
END

FROM dbo.T_EOLT_BRUTE_FLOAT
Post #1422624
laurie-789651
Posted Thursday, February 21, 2013 8:33 AM


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When you say it's not working - do you mean it errors or it produces unexpected results?
Post #1422629
laurie-789651
Posted Thursday, February 21, 2013 8:35 AM


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How about = instead of 'AS'



create view dbo.GlobaldataEOLT2

as

select [NUMCAM]
,[C_Fourn]
,[date_passage]
,[heure_passage]
,[banc]
,[NUMPale]
,[Module_Status]
,[Code_defaut]
,[Total_TestTime]
,[Purgerunin_TestTime]
,[ShifterPosHyst_TestTime]
,[ShifterActRespTime_TestTime]
,[GearActStroke_TestTime]
,[GearActRespTime_TestTime]
,[LeakageON_TestTime]
,[K1K2Leakage_TestTime]
,[QPVK1DeliveryTest_TestTime]
,[PPVK2PressureTest_TestTime]
,[LeakageOFF_TestTime]
,[PRVTest_TestTime]
,[OPS_NRV_Test_TestTime]
,[version_prog]
,[Jourprod] =
CASE WHEN heure_passage BETWEEN '00:00:00' and '05:59:59' THEN day(jour_passage) -2
ELSE day([date_passage]) -1
END

FROM dbo.T_EOLT_BRUTE_FLOAT


or


CASE WHEN heure_passage BETWEEN '00:00:00' and '05:59:59' THEN day(jour_passage) -2
ELSE day([date_passage]) -1
END as [Jourprod]
Post #1422631
asiaindian
Posted Thursday, February 21, 2013 8:36 AM
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Could you please recheck the CASE statement...I think it should be..

-- [Jourprod] AS
CASE WHEN heure_passage BETWEEN '00:00:00' and '05:59:59' THEN day(jour_passage) -2
ELSE day([date_passage]) -1
END AS [Jourprod]
Post #1422633
ohpenot
Posted Thursday, February 21, 2013 8:40 AM
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Indeed!

It works this way:
select
,....
,[version_prog]
,(CASE WHEN heure_passage BETWEEN '00:00:00' and '05:59:59' THEN (day(date_passage) -2)
ELSE (day([date_passage]) -1)
END) AS jourprod

FROM dbo.T_EOLT_BRUTE_FLOAT

Thanks Laurie, Asiaindian!
Post #1422636
ohpenot
Posted Monday, February 25, 2013 8:57 AM
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Another problem linked to this one..
The query works fine now, even if i don't like not being able to write "jprod as....query treatement here"
What if i need to define the computed column "jprod" as persisted?
I tried to put the keyword PERSISTED wherever it could be and i got an error in each case.

SELECT [NUMCAM]
,[date_passage]
,[heure_passage]
,[anneeprod]
,(CASE WHEN heure_passage BETWEEN '00:00:00' and '05:59:59' THEN day(date_passage) - dbo.jprodtestannee(anneeprod)
ELSE day(date_passage) - dbo.jprodtestannee(anneeprod) +1
END) as jprod
FROM dbo.GlobaldataEOLT8
GO

I tried to re-write the query the way i feel more comfortable with :

..jprod as (CASE WHEN....) PERSISTED but the error remains, can't get it solved.
Post #1423645
Sean Lange
Posted Monday, February 25, 2013 9:15 AM


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ohpenot (2/25/2013)
Another problem linked to this one..
The query works fine now, even if i don't like not being able to write "jprod as....query treatement here"
What if i need to define the computed column "jprod" as persisted?
I tried to put the keyword PERSISTED wherever it could be and i got an error in each case.

SELECT [NUMCAM]
,[date_passage]
,[heure_passage]
,[anneeprod]
,(CASE WHEN heure_passage BETWEEN '00:00:00' and '05:59:59' THEN day(date_passage) - dbo.jprodtestannee(anneeprod)
ELSE day(date_passage) - dbo.jprodtestannee(anneeprod) +1
END) as jprod
FROM dbo.GlobaldataEOLT8
GO

I tried to re-write the query the way i feel more comfortable with :

..jprod as (CASE WHEN....) PERSISTED but the error remains, can't get it solved.


PERSISTED is used for computed columns. You are creating a view, this means the calculation will have to run everytime you select the data. If you want to avoid this you would need to add the computed column to your base table.

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Post #1423659
Sergiy
Posted Monday, February 25, 2013 8:29 PM
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Sean Lange (2/25/2013)
.. you would need to add the computed column to your base table.

or create an indexed view.

There are requirements to meet though - check BOL for details.
Post #1423863
Sean Lange
Posted Wednesday, February 27, 2013 7:53 AM


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Sergiy (2/25/2013)
Sean Lange (2/25/2013)
.. you would need to add the computed column to your base table.

or create an indexed view.

There are requirements to meet though - check BOL for details.


Not sure I follow you here. You don't need to have an indexed view to have a calculation in it. The point of using PERSISTED is so that the engine does not have to calculate the value every time you retrieve a row. It does this by physically storing the results in the table. A view does not store any data so the calculation would not be stored. I agree though that an indexed view sounds like the best solution for the OP's situation.

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Post #1424546
Sergiy
Posted Wednesday, February 27, 2013 9:31 PM
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Sean Lange (2/27/2013)
. A view does not store any data so the calculation would not be stored.

An indexed view does.
Another name for it is "materialized view" - because all the calculations and conversions are actually stored in the index(es).
Post #1424881
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