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Select records between a date range


Select records between a date range

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Nisha-475382
Nisha-475382
Ten Centuries
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This is my query:

SELECT * FROM [MyDateTable]
WHERE CONVERT(VARCHAR,StartDate,101)
BETWEEN '02/01/2007' AND '01/04/2008'

It return absolutely nothing, although there are eleven eligible records within this date range. few in Feb 2007 and others in May 2007.

What could be wrong in this?
Jeff Moden
Jeff Moden
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It's because you're converting the dates to text... try this, instead...

SELECT * FROM [MyDateTable]
WHERE StartDate >= '02/01/2007'
AND StartDate < '01/05/2008'

Notice that the "<" is in relation to the NEXT day after you want... this is to allow all the times on 01/04/2008 to be included without a conversion to a whole date. This method also allows for the use of an index "seek" whereas your method will not.

--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

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Matt Miller (4)
Matt Miller (4)
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Don't convert your dates to string - convert your strings to dates. As of right now you're comparing string values (where '02/01/2007' >'01/28/2008').

you want:

SELECT * FROM [MyDateTable]
WHERE StartDate
BETWEEN cast('02/01/2007' as datetime)
AND cast('01/04/2008' as datetime)



of course - you can also let T-SQL do the implicit conversion for you with:

SELECT * FROM [MyDateTable]
WHERE StartDate
BETWEEN '02/01/2007' --this gets converted to a date
AND '01/04/2008' --this gets converted to a date



----------------------------------------------------------------------------------
Your lack of planning does not constitute an emergency on my part...unless you're my manager...or a director and above...or a really loud-spoken end-user..All right - what was my emergency again?
Nisha-475382
Nisha-475382
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Perfect, Matt! That's just what I wanted. Figured it out only after i hurriedly posted the query Smile
Thanks, Jeff!
Jeff Moden
Jeff Moden
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No... it's not perfect if you want to include the whole day of 01/04/2008...

--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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Nisha-475382
Nisha-475382
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What's perfect is: 'Don't convert your dates to string - convert your strings to dates'

That's all i needed Smile cuz the query I've written uses the comparison operators '>=' and '<='.. which is why I said: 'Thanks, Jeff'!
Jeff Moden
Jeff Moden
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You're missing the point... you will not get all of 01/04 using BETWEEN...

--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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Nisha-475382
Nisha-475382
Ten Centuries
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Ok.. Here's my query:


SELECT * FROM [MyDateTable]
WHERE StartDate >= CONVERT(DATETIME, '02/01/2007')
AND StartDate <= CONVERT(DATETIME, '01/04/2008')

This works fine, Jeff! Which is why I was saying, I used Matt's ''don't convert your date field to string'' and I used your ' operators instead of the BETWEEN'.

Do you think I've gotten the point now? Smile
Jeff Moden
Jeff Moden
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No...

--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:
How to post code problems
How to post performance problems
Forum FAQs
Jeff Moden
Jeff Moden
SSC Guru
SSC Guru (212K reputation)SSC Guru (212K reputation)SSC Guru (212K reputation)SSC Guru (212K reputation)SSC Guru (212K reputation)SSC Guru (212K reputation)SSC Guru (212K reputation)SSC Guru (212K reputation)

Group: General Forum Members
Points: 212095 Visits: 41977
Unless none of your dates have times on them, the original query and the replacement query are bad...

--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:
How to post code problems
How to post performance problems
Forum FAQs
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