cast does not work in case statement

Question

cast does not work in case statement

timscronin

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Points: 6851
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December 28, 2010 at 7:24 am

#388514

I had a developer show me some tsql which is puzzling. He does a cast with inline and it works fine, in the case we get the error
Msg 241, Level 16, State 1, Line 1
Conversion failed when converting date and/or time from character string.
CASE WHEN h.TSITEM_TYP_NAM <> '&TotaledSpan'
THEN v.ENTEREDONDTM
-- WHEN h.TSITEM_TYP_NAM = '&TotaledSpan'
-- THEN CAST(spe.ENTEREDONDTM AS varchar(25)) + ' \ ' + CAST(epe.ENTEREDONDTM AS varchar(25))
ELSE COALESCE(t.STRT_DTM, t.END_DTM)
END AS EditingDt, CAST(spe.ENTEREDONDTM AS varchar(25)) + ' \ ' + CAST(epe.ENTEREDONDTM AS varchar(25)) as testdate

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toddasd SSCertifiable Points: 6298 More actions · Answer 1

Some sample data and DDL please.

______________________________________________________________________________
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timscronin SSCertifiable Points: 6851 More actions · Answer 2

sorry here is sample data from concatenation

Nov 1 2010 1:29PM \ Nov 1 2010 11:13AM

Nov 9 2010 8:23AM \ Nov 11 2010 8:46AM

Nov 11 2010 8:46AM \ Nov 9 2010 8:26AM

Nov 9 2010 8:24AM \ Nov 9 2010 11:34AM

THe 2 fields involved are both datetime. If the concatenation is done with the case it fails, as a straight select it works

parthi-1705 SSCrazy Eights Points: 9277 More actions · Answer 3

Hi,

Have a look at this

declare @Temp table(Rid int identity,Col1 varchar(20),ddate datetime)

Insert into @Temp

Select 'Hi',GETDATE()

Union all

Select 'This is',GETDATE()

Union all

Select 'Test',GETDATE()

-- Case :1

Select Case When Col1='Hi' then 'Hello'+' '+CAST(ddate AS varchar(25)) else Col1 end from @Temp

-- Case :2

Select Case When Col1='Hi' then 'Hello'+' '+CAST(ddate AS varchar(25)) else ddate end from @Temp

Here in case:1 will work since we are converting varchar value to varchar where as in case:2 it is datetime column where we cant do conversion with varchar to column

Thanks

Parthi

Thanks
Parthi

Charles Hearn SSCrazy Points: 2680 More actions · Answer 4

You need to make sure that all of the values returned by the case expression are of the same data type. It appears that you are mixing a datetime data type with a varchar, causing the error. Try something like below:

SELECT CASE

WHEN h.TSITEM_TYP_NAM <> '&TotaledSpan' THEN CAST(v.ENTEREDONDTM AS VARCHAR(25))

WHEN h.TSITEM_TYP_NAM = '&TotaledSpan' THEN CAST(spe.ENTEREDONDTM AS varchar(25)) + ' \ ' + CAST(epe.ENTEREDONDTM AS varchar(25))

ELSE COALESCE(CAST(t.STRT_DTM AS VARCHAR(25)),CAST(t.END_DTM AS VARCHAR(25))) END AS EditingDt

GSquared SSC Guru Points: 260824 More actions · Answer 5

Are you building a dynamic SQL query? It looks like it. If so, then the datetime variable may not be properly enclosed in single-quotes.

If that's not the situation, what is the value of "&TotaledSpan" at runtime?

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Abhijeet Chavan SSCommitted Points: 1511 More actions · Answer 6

It seems like you have 2 different columns EditingDt and testDate.

So case in one column has nothing to do with cast in another column.

What is the datatype of t.STRT_DTM, t.END_DTM , (by the name i think it is datetime)??

Please post a test script so that we all can try to help u better.