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06.23.2008 at 09:43AM PDT, ID: 23508209
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9.1

Returning a rows maximum value

Asked by tonMachine100 in Oracle 9.x

Tags: ,

I want to query the table to get back the maximum value (in this instance, the most recent date) from each row. Please see attached for sample data (fig 1) and desired output (fig. 2)

I could probably do this using the attached sql but was wondering if there was a more efficient way of doing this?

thanksStart Free Trial 
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select
client_id,
max(date_field) max_date
from
(select Client_id, start_date as date_field from sample_table
union
select Client_id, end_date as date_field from sample_table
union
select Client_id, update_date as date_field from sample_table
union
select Client_id, reassign_date as date_field from sample_table)
group by
client_id
Attachments:
 
Sample.xls (13 KB) (File Type Details) 
sample
 
[+][-]06.23.2008 at 10:00AM PDT, ID: 21848109

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[+][-]06.23.2008 at 10:11AM PDT, ID: 21848201

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[+][-]06.23.2008 at 10:19AM PDT, ID: 21848261

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[+][-]06.23.2008 at 12:20PM PDT, ID: 21849387

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About this solution

Zone: Oracle 9.x
Tags: SQL Oracle, 9
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Solution Provided By: awking00
Participating Experts: 3
Solution Grade: A
 
 
 
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