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Type conversions and Nulls


Type conversions and Nulls

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Miles Neale
Miles Neale
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Thanks Tom. After a number of controversial questions and explanations it is great to have one that makes you think and is right on target.

+1

Not all gray hairs are Dinosaurs!
chgn01
chgn01
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Please try:
declare @k int;
select
case when @k=0 OR NOT (@k = 0)
then cast(0 as date)
else cast('2012-04-01T10:00:00' as datetime)
end as [when] ;

and

declare @k int;
select
case when @k=0 OR NOT (@k = 0)
then cast('04/01/2012T10:00:00' as date)
else cast('2012-04-01T10:00:00' as datetime)
end as [when] ;

--------------------------------------
;-)“Everything has beauty, but not everyone sees it.” ― Confucius
Rob Schripsema
Rob Schripsema
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Great question, Tom

I almost wish you had thrown in an option of '2012-04-01 10:00:00.000' to spice up the thinking a bit more. Of course, then I probably would have gotten it wrong....

Rob Schripsema
Propack, Inc.
Tom Thomson
Tom Thomson
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chgn01 (2/5/2013)
Please try:
declare @k int;
select
case when @k=0 OR NOT (@k = 0)
then cast(0 as date)
else cast('2012-04-01T10:00:00' as datetime)
end as [when] ;

Well, that will fail with an error at cast(0 as date)

and

declare @k int;
select
case when @k=0 OR NOT (@k = 0)
then cast('04/01/2012T10:00:00' as date)
else cast('2012-04-01T10:00:00' as datetime)
end as [when] ;

Well, it seems quite reasonable that cast('2012-04-01T10:00:00' as datetime) should deliver
2012-04-01 10:00:00.000

Tom

Ken Wymore
Ken Wymore
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Nice question and explanation. Thanks Tom.
Olga B
Olga B
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Well, the good news is, I got NULLs down pat. The less good news is, I didn't even stop to think about type precedence.

Conclusion - time for more coffee.
john.arnott
john.arnott
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Olga B (2/5/2013)
Well, the good news is, I got NULLs down pat. The less good news is, I didn't even stop to think about type precedence.

Conclusion - time for more coffee.
+1 on that.
And as for the collation specification, I figured that was just Tom's QOD signature since most of his contributions that I recall had to do with that.

Overall, very good one.
David in .AU
David in .AU
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Curse you Precedence!

always the one that I forget about, ah well Smile
kapfundestanley
kapfundestanley
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Easy one for me .

“When I hear somebody sigh, ‘Life is hard,’ I am always tempted to ask, ‘Compared to what?’” - Sydney Harris
mtassin
mtassin
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Good question, thank you for writing it!



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MCITP - SQL Server DBA
Proud member of the Anti-RBAR alliance.
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