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From "Sunderlin, Mark" <mark.sunder...@teamaol.com>
Subject RE: why I get Table not found 'dual'
Date Thu, 18 Oct 2012 16:09:20 GMT
I creates a single column, single row table called 'dual'


1.	Create a text file on HDFS, call it a.txt with just the letter 'a' (or any single character
in it)
2.	Create the single column table, dual: 'create table dual (x, string);'
3.	Load the text file into dual: load data local inpath '... /a.txt' overwrite into table
dual;  (replace '...' with the path to the HDFS directory you created a.txt in)
4.	Enjoy using it just like you do in Oracle: select parse_url('http://autos.aol.com/gallery/best-trucks-fuel-economy/',
'HOST') from dual

A quick AOL search and I see this guy did pretty much the same:

http://bigdatadw.blogspot.com/2012/02/dual-table-in-hive.html

---
Mark E. Sunderlin
Solutions Architect |AOL Core Data Technologies
P: 703-265-6935     |C: 540-327-6222 | AIM: MESunderlin
22000 AOL Way | Dulles, VA | 20166

-----Original Message-----
From: Kaufman Ng [mailto:kaufman@cloudera.com] 
Sent: Thursday, October 18, 2012 9:45 AM
To: user@hive.apache.org
Cc: fellowtree
Subject: Re: why i get Table not found 'dual'

The 'dual' table is a feature in Oracle only I believe.

There's an open Jira for this.  You can try Edward Capriolo's project (described in the jira)
which allows you to use dual.
https://issues.apache.org/jira/browse/HIVE-1558

On Thu, Oct 18, 2012 at 2:29 AM, MiaoMiao <liy099@gmail.com> wrote:
> Do you even have a table name 'dual' or not?
>
> On Thu, Oct 18, 2012 at 2:24 PM, fellowtree <fellowtree@163.com> wrote:
>> hi all:
>>      some one said hive support sql like  select if(1=2,100,200) from 
>> dual; however i always get Table not found 'dual' . my hive is 0.9.0 
>> and what is the reason?
>>
>> ________________________________
>> fellowtree

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