Topic: Performance & Tuning >> About "Connect by Prior".. any suggestion, please
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| Title: About "Connect by Prior".. any suggestion, please |
| Majda |
Posted: Dec 05, 2005 02:14:42 PM |
Total Post: 3
Joined: Dec, 2005
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Hello every Dba and every body,
Here is my SQL order and I try to re-write it, because it's so slow ...
but I don't know how to do ... Because, I'm not used to work with "connect by"
"
select max(col3)
from toto
having rownum = 1
group by rownum
connect by prior col1 = col2
start with col2 = 'TTTT';
"
Thank you very much in advance.
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 Vigyan |
| Posted: Dec 05, 2005 02:33:28 PM |  |
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Total Post: 386
Joined: May, 2001
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Did you tried running queries without the following.
having rownum = 1
group by rownum
Do you need it?
Vigyan
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| Majda |
| Posted: Dec 05, 2005 02:44:05 PM | |
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Total Post: 3
Joined: Dec, 2005
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hi Vigyan,
In fact, I don't understand this order ...
It was is writed by another user who left our service.
And I'm not used to work with "connect by Prior" ...
I dont' understand what is the utility of "rownum=1" on "Connect Prior order" ...
If anyone has any idea, thank a lot ...
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| Vigyan |
| Posted: Dec 05, 2005 03:28:48 PM | |
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Total Post: 386
Joined: May, 2001
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I dont think, you need rownum condition.
Read the document for Oracle Hierarchical queries at the following link.
http://www.oracle.com/technology/oramag/webcolumns/2003/techarticles/gennick_connectby_pt2.html
Hope it helps.
Vigyan
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