t; 1.4 2.4 3.4
>>
>>
>>
>> You could of course then resave it in .csv format. But if the entire
>> process needs to be automated within Hive, then my Hive query skills are
>> not quite that advanced yet (I’ve only been using Hive for about a month).
>&
ld of course then resave it in .csv format. But if the entire
> process needs to be automated within Hive, then my Hive query skills are
> not quite that advanced yet (I’ve only been using Hive for about a month).
>
>
>
> Paul
>
>
>
>
>
> *From:* Sowjanya Kakarala &
Maybe use ROW_NUMBER() OVER () AS row_num for each table to create a
sequence number and then (full outer) join all tables on row_num
Probably best done outside SQL though
On 15/05/2018 18:32, Sowjanya Kakarala wrote:
I am trying to fetch data from hive for 8tables at a time and save it
in a
Kakarala <sowja...@agrible.com>
Sent: Tuesday, May 15, 2018 1:33 PM
To: user@hive.apache.org
Subject: Re: Combining hive tables as one query
I am trying to fetch data from hive for 8tables at a time and save it in a csv,
so that our pipeline would read that csv which had 8tables data like
Ok. There are 8 tables. Do you see any conditional match based on some
keys? May be a well designed 'Left/Right' join provisioning would help you
tackling your use case. You can also look at merge or union options. Once
you are able to correlate those tables and design a query which would give
you
I am trying to fetch data from hive for 8tables at a time and save it in a
csv, so that our pipeline would read that csv which had 8tables data like:
tb1 tb2 tb3 tb4 tb5 tb6 tb7 tb8
0.1 1.1 2.1 -1.1 -0.1 0.1 0.2 3.2
1.2 0.4 4.1 -2.1 -0.5 0.2 0.3 6.2
and so on
If I fetch one table at a time
May 15, 2018 12:34 PM
To: user@hive.apache.org
Subject: Re: Combining hive tables as one query
ok. but in my usecase join's/union's wont help.
Here is an example of my usecase from postgres, which I have to do it in
similar way for hive.
with recursive
a as (select col from tb1),
b as (select col fr
You are correct that Hive does not support "with recursive". A few more
details of what you are trying to do would be helpful, since it's not clear
why you need the iteration provided by "with recursive". If you really
need the iteration I don't think Hive can do what you want.
Alan.
On Tue,
ok. but in my usecase join's/union's wont help.
Here is an example of my usecase from postgres, which I have to do it in
similar way for hive.
with recursive
a as (select col from tb1),
b as (select col from tb2),
c as (select col from tb3)
select a,b,c from a,b,c;
which output's me in a
In general this is done using joins, as in all SQL engines. A google
search on "intro to SQL joins" will suggest a number of resources, for
example
https://www.essentialsql.com/get-ready-to-learn-sql-12-introduction-to-database-joins/
Alan.
On Tue, May 15, 2018 at 7:37 AM, Sowjanya Kakarala
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