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DECLARE - 1


DECLARE - 1

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bitbucket-25253
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Comments posted to this topic are about the item DECLARE - 1

If everything seems to be going well, you have obviously overlooked something.

Ron

Please help us, help you -before posting a question please read

Before posting a performance problem please read
Lokesh Vij
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Thanks for this easy point Ron in the middle of the week :-)

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Oldie but a goodie :-)


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can anyone explain me why select len(@a) as 'declared' gives output as 1

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To get quick answer follow this link:
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Kingston Dhasian
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kapil190588 (10/2/2012)
can anyone explain me why select len(@a) as 'declared' gives output as 1


The answer to this is available in the explanation to the question( also shown below )

When n (Where n defines the string length) is not specified in a data definition or variable declaration statement, the default length is 1


Hence the two declaration shown below are equivalent

DECLARE @a VARCHAR ='xyz' 

DECLARE @a VARCHAR(1) = 'xyz'




Kingston Dhasian

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Stewart "Arturius" Campbell
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Easy one for middle of the week, thanks Ron

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thanks Kingston..

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Thanks Ron - easy one for me today

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As usual the lesson is not to rely on the defaults.

I'd have expected a near 100% success rate given the number of similar questions we've had in recent months, but obviously it still needs repeating!
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Got to know that by default it takes the length as 1 if the size is not declared. Thank you....

However, I still did not get the difference between length of normal declaration and Cast/Convert... Please find below the queries....


1) SELECT
LEN('xyz') AS 'Declared'
, LEN(CONVERT(VARCHAR,'xyz')) AS 'Converted'
, LEN(CAST('xyz' AS VARCHAR)) AS 'Cast'

Ans : 3,3,3


2)
DECLARE @a VARCHAR ='xyz'

SELECT
LEN(@a) AS 'Declared'
, LEN(CONVERT(VARCHAR,@a)) AS 'Converted'
, LEN(CAST(@a AS VARCHAR)) AS 'Cast'

Ans : 1,1,1

I did not get default of 30 (which you mentioned in the answer in case of Cast/Convert) in what ever way I try... Can you please explain more on this?
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