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computed column in view


computed column in view

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ohpenot
ohpenot
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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
laurie-789651
laurie-789651
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When you say it's not working - do you mean it errors or it produces unexpected results?
laurie-789651
laurie-789651
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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]



asiaindian
asiaindian
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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]
ohpenot
ohpenot
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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!
ohpenot
ohpenot
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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.
Sean Lange
Sean Lange
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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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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.
Sean Lange
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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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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).
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