Solved

percentage growth of the last 30 days compared to the total

Posted on 2008-06-09
4
1,496 Views
Last Modified: 2012-06-21
Given a table 'mailing':

CREATE TABLE mailing (
      addr VARCHAR(255) NOT NULL
);

The mailing table will initially be empty.  

New addresses will be added on a daily basis.  

It is expected that the table will store at least 10,000,000 email addresses and 100,000 domains.

Write a script in perl or python that updates

      another table which holds a daily count of email addresses by their domain name.

Use this table to report the top 50 domains by count
      sorted by percentage growth of the last 30 days compared to the total.
** NOTE **

- The original mailing table should not be modified.

- All processing must be done in Perl or Python (eg. no complex queries or sub-queries)

- Submit a compressed file(tar/zip) with the files required to run your script.
0
Comment
Question by:amirmaster
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 15

Expert Comment

by:rob_farley
ID: 21829452
This sounds like an exam question. And it's not a SQL question if you're not allowed to do use a query to do the work.

In SQL, you could easily query the top 50 by count, joining it back to a query which counted the ones that appeared more than 30 days ago, ordering by one divided by the other. But that's not what this (exam) question is asking - it wants you to do in perl, and I doubt you'll get many marks when your instructor finds you've given a result posted on the web.

Rob
0
 

Author Comment

by:amirmaster
ID: 22852042
I did it my self
0
 

Accepted Solution

by:
amirmaster earned 0 total points
ID: 22852091
select top 50 from mailing where
id in (
          select top 30 from mailing where datediff(date,getdate())<30 order by date
       )
0

Featured Post

Free eBook: Backup on AWS

Everything you need to know about backup and disaster recovery with AWS, for FREE!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction: When running hybrid database environments, you often need to query some data from a remote db of any type, while being connected to your MS SQL Server database. Problems start when you try to combine that with some "user input" pass…
Use this article to create a batch file to backup a Microsoft SQL Server database to a Windows folder.  The folder can be on the local hard drive or on a network share.  This batch file will query the SQL server to get the current date & time and wi…
If you're a developer or IT admin, you’re probably tasked with managing multiple websites, servers, applications, and levels of security on a daily basis. While this can be extremely time consuming, it can also be frustrating when systems aren't wor…
Do you want to know how to make a graph with Microsoft Access? First, create a query with the data for the chart. Then make a blank form and add a chart control. This video also shows how to change what data is displayed on the graph as well as form…

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question