Selecting a column from a table conditionally

I'm trying this select statement (example):
select np.phone_number from name_phone np, reservation_general_view rgv
where rgv.resort='HVILLA'
In this table there is a column called "phone_type" and I only want my column to display values that are associated to the column when the "phone_type" = 'EMAIL'
I tried this:
select np.phone_number(select np.phone_number from name_phone np where np.phone_type='EMAIL')
from name_phone np, reservation_general_view rgv
where rgv.resort='HVILLA'
This doesn't seem to work...can someone tell me how to do that?
Message was edited by:
JonnyOpera

select phone_number from name_phone
where resort='HVILLA'
and phone_type='EMAIL'

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http://www.trendo-kft.hu

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Hi,
I am using an Oracle DB 10g. I have a table with 250 columns and I need to select 200 columns out of them. The table holds around 0.1 million rows. But when I run the select sql it takes 15 mins to return .1 million rows. Where as if I select only 10 or 15 columns the sql runs in less than a minute returning same number of rows. My sql looks like below:
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961796 wrote:
I am using an Oracle DB 10g. I have a table with 250 columns and I need to select 200 columns out of them. The table holds around 0.1 million rows. But when I run the select sql it takes 15 mins to return .1 million rows. Where as if I select only 10 or 15 columns the sql runs in less than a minute returning same number of rows. My sql looks like below:
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If you're testing from SQL*Plus then setting the arraysize to a value larger than the default might help.
If you have control over the SQL*Net settings then you may get some benefit by adjusting the SDU sizes at both ends of the link.
If you have control over the tcp configuration (transmit and receive buffer sizes) then you may get some benefit by adjusting these.
Simple test, by the way, if you're on SQL*Plus
set autotrace traceonly statistics
select ...This will dump your data in the bit bucket as it arrives giving you
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Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
Author: <b><em>Oracle Core</em></b>

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http://www.ddbcinc.com/askDDBC

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Message was edited by:
Delfino Nunez

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Selecting a column from a table conditionally

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