question Re: Hive query for functions in Support Questions

Hive query for functions

mystefied_ — Wed, 23 Mar 2022 05:30:12 GMT

I'm a newbie, I want to calculate month on month percentage change in price change in my table. Im using hive and using query:

select year(stock_date),month(stock_date),sum(stock_price) over (partition by year(stock_date),month(stock_date) ORDER BY month(stock_date)), PERCENT_RANK() OVER(ORDER BY month(stock_date) DESC) AS per from table4;

it's generating, It's showing July 2019 at the top and goes descending thru the numbers. how do I get the months in correct order and the percentage change with it?

can anyone help me understand what am I doing wrong?

Re: Hive query for functions

araujo — Wed, 23 Mar 2022 09:14:28 GMT

@mystefied_ ,

Would you be able to describe in words what is the desired results of the query?

The query above doesn't make much sense to me but if you explain what you want to achieve I should be able to help you get the right query.

Cheers,

André

Re: Hive query for functions

mystefied_ — Wed, 23 Mar 2022 13:28:13 GMT

Sure, I want to compare pricing across months by viewing percentage change across months.

Re: Hive query for functions

araujo — Wed, 23 Mar 2022 23:56:06 GMT

@mystefied_ ,

What's the granularity of the data in the table? Do you have one row per day, multiple rows per day?

What's the "month price" that you need to consider? Average of the intra-month prices, max, min?

ANdré

Re: Hive query for functions

mystefied_ — Thu, 24 Mar 2022 00:05:34 GMT

There is one row per date. to compare the difference over months, I was to sum the amount of each month, then find percentage change of the total price each month.

I'm trying the date_trunc function, but it isnt working.

Re: Hive query for functions

araujo — Thu, 24 Mar 2022 09:41:40 GMT

@mystefied_ ,

Please try this:

select month, month_total, month_total / lag(month_total, 1) over (order by month) as percentage_over_previous_month, sum(month_total) over (order by month) as running_sum, sum(month_total) over (order by month) / sum(month_total) over (partition by 1) as running_percentage from ( select trunc(stock_date, 'MONTH') as month, sum(stock_price) as month_total from table4 group by trunc(stock_date, 'MONTH') ) x

Cheers,

André

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Re: Hive query for functions

mystefied_ — Thu, 24 Mar 2022 17:44:41 GMT

Im getting this error when executing the above query, I might be running an old version of hive

FAILED: SemanticException [Error 10011]: Line 4:9 Invalid function 'trunc'

Re: Hive query for functions

araujo — Thu, 24 Mar 2022 22:50:15 GMT

@mystefied_ ,

Which version of Hive are you using? That query works well on my cluster.

Nevertheless, you should be able to run the below, which is pretty much the same:

select yr, mth, month_total, month_total / lag(month_total, 1) over (order by yr, mth) as percentage_over_previous_month, sum(month_total) over (order by yr, mth) as running_sum, sum(month_total) over (order by yr, mth) / sum(month_total) over (partition by 1) as running_percentage from ( select year(stock_date) as yr, month(stock_date) as mth, sum(stock_price) as month_total from table4 group by year(stock_date), month(stock_date) ) x

Cheers,

André

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Re: Hive query for functions

mystefied_ — Sat, 26 Mar 2022 05:24:30 GMT

I am running version Hive 1.1.0-cdh5.4.3

When I ran the most recent query, It's giving me the following error:

Re: Hive query for functions

araujo — Sat, 26 Mar 2022 05:29:26 GMT

Woah! CDH 5.4.3 is *really* old. Unfortunatelly I don't have a cluster running that version here to test.

Hive has come a long way since then. We're already using Hive 3 on CDP 7.x.

I'd recommend you upgrade your system, if possible.

Cheers,

André

Re: Hive query for functions

mystefied_ — Sat, 26 Mar 2022 05:38:51 GMT

Im using a VM that is running this version. I'll try if I can update it. In case I can then I;ll try your queries again.

Thanks a lot for trying to help.

Re: Hive query for functions

mystefied_ — Sat, 26 Mar 2022 15:04:06 GMT

Hello Andre,

Can you share the steps to upgrade the CDH / Hive to version 2 or 3 so at least the above commands can execute.

Also advise if I can download CDH 7 or 6 VM from Cloudera website, I do not have an active subscription but need trial for few days.

Thanks a lot for your help.

Re: Hive query for functions

araujo — Sun, 27 Mar 2022 22:42:38 GMT

@mystefied_ ,

You can download the CDP Trial version from the Cloudera website below:

https://www.cloudera.com/downloads/cdp-private-cloud-trial/cdp-private-cloud-base-trial.html

Cheers,

André