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SET ROWCOUNT and table variable


SET ROWCOUNT and table variable

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Carlo Romagnano
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Comments posted to this topic are about the item SET ROWCOUNT and table variable
Oleg Netchaev
Oleg Netchaev
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This is an excellent question, thank you. I answered it correctly because for years I cannot find the answer to the following question: why would anyone ever consider casually using float data type? I understand that there might be some specific scenarios where the inaccuracy of calculations are not important and the range of the numbers is huge, but using float for no good reason is astonishingly bad not to say plain silly. The query in Qotd is one fine example demonstrating this point.

Oleg
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Thanks for the question, I had to puzzle it out for a while, but got it right.
malleswarareddy_m
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for testing folating point the same can be written as

DECLARE @i float,@rc int
set @i = 0
while @i <> 1
begin
set @i = @i + 0.1
end
select @i

then the loop never executes.

I observer some intrested behavior of floating point


DECLARE @i float,@rc int
set @i = 0
while @i <> 1
begin
set @i = 0.8999 + 0.1
end
select @i

the above will never executes. we use 0.1 instead of 0.8999 other wise we can use 0.2,0.3,0.4,0.5,0.6,0.7,0.8.but when i added 0.9 it executes

and show 1 as answer.

Malleswarareddy
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The answer was almost obvious from the "do not run it on production server" recommendation.

But, a good question for highlighting the pitfalls of "float".


Cheers,
- Mark
Stewart "Arturius" Campbell
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The only possible use for the float datatype that I have found is in the calculations used in astro-physics, where the distance between stars and galaxies is an approximation, at best

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SQLRNNR
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Thanks for a great question.



Jason AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server, MVP


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Koen Verbeeck
Koen Verbeeck
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Great question. I got it wrong though. I do not really understand how the scope of the type variable works. It seems you can define it over and over again, without an error being thrown?



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Michael Riemer
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Very interesting question and great explanations. Thanks
Open Minded
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isn't it possible to use approximation if one is not specific of the exact value of the approximation, like "less than" and "greater than" ?
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