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GetDate() 5 Years ago without time formated 'YYYY-MM-DD'


GetDate() 5 Years ago without time formated 'YYYY-MM-DD'

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Welsh Corgi
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I'm trying to restrict a query to go back five years ago.

I have the following query which is not in the format that I need.


SELECT convert(varchar(11), DateAdd(yy, -5, GetDate()))


Returns:


Jun 23 2008


What I need is the following:


'2008-06-23'




Thank you.

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SELECT convert(varchar(10), DateAdd(yy, -5, GetDate()),120)



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Welsh Corgi
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Hey, thank you very much!

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Since we're talking about SQL Server 2008 here, any issue with using the date type?

SELECT CONVERT(DATE, DateAdd(yy, - 5, GetDate()));




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Welsh Corgi
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I'm using the Derived Date in the WHERE Clause.

WHERE Effective_Date <

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Welsh Corgi
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Thanks for the help guys.

I'm using the Data calculation in the WHERE Clause.

WHERE Effective_Date < CONVERT(DATE, DateAdd(yy, - 5, GetDate()));

Does it matter which method I use as far as performance?

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Welsh Corgi (6/24/2013)

Does it matter which method I use as far as performance?


If you're only applying the convert to a variable/static value, like GETDATE(), it doesn't matter at all from a performance point of view. If you have to apply it to a column, then the latter is preferable in most scenarios as it's (mostly) SARGable.
MMartin1
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Create a date variable , assign the value of
CONVERT(DATE, DateAdd(yy, - 5, GetDate())) 

to the variable and use the variable instead in your query. This may be more efficient.

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Sean Lange
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mmartin1 (7/12/2013)
Create a date variable , assign the value of
CONVERT(DATE, DateAdd(yy, - 5, GetDate())) 

to the variable and use the variable instead in your query. This may be more efficient.


How does using a variable here make it more efficient? The optimizer is smart enough that it does this calculation one time because it is using a constant and not a column.

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Right. It seems intuitive. I've found that has not always been the case with my queries.

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