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:kauf...@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 <liy...@gmail.com> wrote:
> Do you even have a table name 'dual' or not?
>
> On Thu, Oct 18, 2012 at 2:24 PM, fellowtree <fellowt...@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
