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WoodHouse
Posting Yak Master

211 Posts

Posted - 2009-11-03 : 02:12:44

Hi

To find out the record which is present in table a,
but not in table b

We can achieve the above using 3 methods


i.                     LEFT JOIN ,RIGHT JOIN 
ii.                   IN, NOT IN 
iii.                  EXISTS, NOT EXISTS

Which would be more optimum?

khtan
In (Som, Ni, Yak)

17689 Posts

Posted - 2009-11-03 : 03:43:51

refer to http://weblogs.sqlteam.com/peterl/archive/2009/06/12/Timings-of-different-techniques-for-finding-missing-records.aspx

KH
[spoiler]Time is always against us[/spoiler]

WoodHouse
Posting Yak Master

211 Posts

Posted - 2009-11-03 : 15:05:52

Hi KH

Thanks

X002548
Not Just a Number

15586 Posts

Posted - 2009-11-03 : 15:10:28

Is there a question?

When's the interview?

Brett

8-)

Hint: Want your questions answered fast? Follow the direction in this link
http://weblogs.sqlteam.com/brettk/archive/2005/05/25/5276.aspx

Add yourself!
http://www.frappr.com/sqlteam

WoodHouse
Posting Yak Master

211 Posts

Posted - 2009-11-03 : 15:15:58

Hi

your question is right?
but i am not a right person.

may be my question formation was like that..am not good in english...(sorry)

thanks

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