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Help with query

Author

Topic

nhess80
Yak Posting Veteran

83 Posts

Posted - 2009-12-03 : 15:00:01

For some reason when I run my query like this below it works fine. But the second way when I add LEFT() or Group by it returns nothing. I don't understand why this is.

Thanks,

Nick

----------------------WORKS------------------------------------

Select LRN

FROM CDRS

Where (DateTimeInt Between 1257033600 AND 1257119999) AND
(OrigGw = 'GB-GW2') AND
(OrigPort = '3') AND
(RoundDuration > 0)AND
(Revenue / RoundDuration *60 = 0.017)

Order by LRN

----------------DOES NOT WORK---------------------------

Select LEFT(LRN,6)

FROM CDRS

Where (DateTimeInt Between 1257033600 AND 1257119999) AND
(OrigGw = 'GB-GW2') AND
(OrigPort = '3') AND
(RoundDuration > 0)AND
(Revenue / RoundDuration *60 = 0.017)

GROUP BY LEFT(LRN,6)
Order by LEFT(LRN,6)

tkizer
Almighty SQL Goddess

38200 Posts

Posted - 2009-12-03 : 15:12:34

Since you aren't using any aggregate functions in the SELECT, why not just use DISTINCT instead?

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server
http://weblogs.sqlteam.com/tarad/

Subscribe to my blog

"Let's begin with the premise that everything you've done up until this point is wrong."

nhess80
Yak Posting Veteran

83 Posts

Posted - 2009-12-03 : 15:22:53

Whenever I add anything like that "DISTINCT, LEFT()" I don't get an error, it just wont return any results and it seems to be because of this "(Revenue / RoundDuration *60 = 0.017)" in the where clause. When I remove that, it works but I need that in there

quote:
Originally posted by tkizer

Since you aren't using any aggregate functions in the SELECT, why not just use DISTINCT instead?

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server
http://weblogs.sqlteam.com/tarad/

Subscribe to my blog

"Let's begin with the premise that everything you've done up until this point is wrong."

vijayisonly
Master Smack Fu Yak Hacker

1836 Posts

Posted - 2009-12-03 : 15:35:09

Try this in your "where"...

Where (DateTimeInt Between 1257033600 AND 1257119999) AND
(OrigGw = 'GB-GW2') AND
(OrigPort = '3') AND
(RoundDuration > 0)AND
(convert(decimal(10,3),(Revenue * 1.0) / RoundDuration *60) = 0.017)

nhess80
Yak Posting Veteran

83 Posts

Posted - 2009-12-03 : 15:49:06

Yes this worked. Can you please explain why this worked???

THank you very much

quote:

Originally posted by vijayisonly

Try this in your "where"...

Where (DateTimeInt Between 1257033600 AND 1257119999) AND
(OrigGw = 'GB-GW2') AND
(OrigPort = '3') AND
(RoundDuration > 0)AND
(convert(decimal(10,3),(Revenue * 1.0) / RoundDuration *60) = 0.017)

vijayisonly
Master Smack Fu Yak Hacker

1836 Posts

Posted - 2009-12-03 : 15:53:52

I'm converting the value to a 3-point decimal using the convert statement since u wanted it to compare with "0.017"...

The reason I multiplied by 1.0 is explained in the link below..

http://sqlblogcasts.com/blogs/madhivanan/archive/2008/01/16/beware-of-implicit-conversions.aspx

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