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Home » Article Discussions » Article Discussions by Author » Discuss content posted by Rahul Kr. Ghosh » smalldatetime

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UMG Developer

Posted Thursday, December 30, 2010 11:55 AM

SSCrazy

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Thanks for the question, and thanks Hugo for your explanation.

This question was really easy, as I knew the errors couldn't happen as they were stated, so there was only one option left.

Post #1041103

L' Eomot Inversé

Posted Monday, January 03, 2011 10:41 AM

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Nice question, terrible explanation. SQL doesn't even have a concept of default values for its various datatypes.

Tom
Que conclure à la fin de tous mes longs propos? C'est que les préjugés sont la raison des sots. (Voltaire, 1756)

Post #1041948

Toreador

Posted Tuesday, January 04, 2011 3:15 AM

Ten Centuries

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"Whenever we use any data type we should know it's default value"

I disagree (even ignoring the valid but slightly pedantic points about datatypes not having defaults).

We should never rely on default values in this way, it is prone to error, and hard to read the code.

If you want to assign a value to a date variable, then explicitly assign the value you want, don't give it a value of a different datatype and rely on implict conversion Smile

Post #1042261

Reji PR

Posted Tuesday, January 04, 2011 11:21 AM

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Thanks for the question.

The default value for the @date1 is NULL.

Please see below proof. If I am commenting the 'set statement, I am getting @date1 as NULL.

declare @date1 smalldatetime

--set @date1 = 0
print Isnull(@date1,getdate())

Thanks.
Reji P R
Hyderabad

Thanks.

Reji PR,
Bangalore
BigGrin

Post #1042601

Hardy21

Posted Tuesday, January 04, 2011 10:00 PM

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@rejipr1982: Hugo already mentioned this in his response. Still thanks to evaluate the same.

Thanks

Post #1042810

john.arnott

Posted Wednesday, January 05, 2011 7:59 PM

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I cannot recall ever using smalldatetime, and now this QOD gives me good reason to avoid it. A max value in year 2079 implies that anyone attempting to save a few bytes per row with this datatype may be leaving a Y2K-like mess for a future programmer or DBA to clean up.

Post #1043454

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