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Display on Month and Year from date formula ??


Display on Month and Year from date formula ??

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jbalbo
jbalbo
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Hi,

I want to display only MM/YY from the formula of @enddate -21??

Thanks
Sean Lange
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jbalbo (2/15/2013)
Hi,

I want to display only MM/YY from the formula of @enddate -21??

Thanks


This type of display should be handled in the front end. SQL is not good at string manipulation like for presentation. Also, you should not use simple math with datetime data like this. You should use DATEADD because the simple math does not work with date or datetime2 datatypes.

If you are deadset on using a t-sql hammer to force sql to do your presentation you can do something like this.


declare @enddate datetime = getdate()

select dateadd(day, -21, @enddate),
right('0' + cast(month(dateadd(day, -21, @enddate)) as varchar(2)), 2) + '/' + cast(year(dateadd(day, -21, @enddate)) as varchar(4))



Please note that this is not my recommendation.

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jbalbo
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Thanks Sean
Great Idea, someone exlse mentioned the simple math problem, now I understand
Jeff Moden
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Sean Lange (2/15/2013)
You should use DATEADD because the simple math does not work with date or datetime2 datatypes.


I have to ask... if you're not using the DATE or DATETIME2 datatypes, why does that matter?

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Jeff Moden (2/15/2013)
Sean Lange (2/15/2013)
You should use DATEADD because the simple math does not work with date or datetime2 datatypes.


I have to ask... if you're not using the DATE or DATETIME2 datatypes, why does that matter?


Consistency? Personally, I don't use the @DataVar + NumDays to add NumDays to a datetime value. I like using the DATEADD function, it provides clarity.

Cool
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I suppose consistency is a good reason. But, let's try something just for fun. Write some code to add 41:41:41.041 to a given date.

--Jeff Moden

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First step towards the paradigm shift of writing Set Based code:
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Jeff Moden (2/15/2013)
I suppose consistency is a good reason. But, let's try something just for fun. Write some code to add 41:41:41.041 to a given date.


My version
DECLARE   @date DATETIME

SET @date = CURRENT_TIMESTAMP

SELECT @date AS Date, DATEADD(MILLISECOND, 41, DATEADD(SECOND, 41, DATEADD(MINUTE, 41, DATEADD(HOUR, 41, @date)))) AS Date_Added



I get the output as below
Date                                  Date_Added
2013-02-18 10:29:50.343 2013-02-20 04:11:31.383



The only strange thing I observed is that it always 40 milliseconds instead of 41 milliseconds.
Is there any other strange thing?


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Kingston Dhasian (2/18/2013)
Jeff Moden (2/15/2013)
I suppose consistency is a good reason. But, let's try something just for fun. Write some code to add 41:41:41.041 to a given date.


My version
DECLARE   @date DATETIME

SET @date = CURRENT_TIMESTAMP

SELECT @date AS Date, DATEADD(MILLISECOND, 41, DATEADD(SECOND, 41, DATEADD(MINUTE, 41, DATEADD(HOUR, 41, @date)))) AS Date_Added



I get the output as below
Date                                  Date_Added
2013-02-18 10:29:50.343 2013-02-20 04:11:31.383



The only strange thing I observed is that it always 40 milliseconds instead of 41 milliseconds.
Is there any other strange thing?


I'll try to get back to this after worrk tonight. In the mean time, remember that DATETIME has an accuracty of only 3.3 milliseconds. All DATETIMES will end with 0, 3, or 7 for the final digit in the milliseconds.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
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ScottPletcher
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declare @enddate datetime
set @enddate = getdate()
SELECT STUFF(CONVERT(varchar(10), DATEADD(DAY, -21, @enddate), 1), 3, 4, '')



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Jeff Moden
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ScottPletcher (2/18/2013)

declare @enddate datetime
set @enddate = getdate()
SELECT STUFF(CONVERT(varchar(10), DATEADD(DAY, -21, @enddate), 1), 3, 4, '')





Except for Sean, we did forget to answer the original question. Blush Thanks, Scott.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

Helpful Links:
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