Solved

Create a  MySQL query to count records and GROUP BY every 7 days for a year?

Posted on 2008-06-26
6
986 Views
Last Modified: 2013-12-12
Hello,
I want to produce a report that counts the number of records that are entered into our database on a weekly basis. Is there a way, just using MySQL, that I can loop through a year's worth of dates, doing a total for each of the 52 weeks? Or do I have to capture all of the data and then parse in a "for" loop in PHP? If the latter, can you help with the PHP code? If the former, can you supply the SQL syntax?
Here is what I have so far:


SELECT DateEntered,Count(ID) AS Total FROM Applications WHERE DateEntered Between '2007-01-01' AND '2007-01-06' Group By DateEntered

Open in new window

0
Comment
Question by:aberns
[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
  • 3
  • 3
6 Comments
 
LVL 20

Accepted Solution

by:
virmaior earned 500 total points
ID: 21875534
try this:
http://dev.mysql.com/doc/refman/5.0/en/date-and-time-functions.html

SELECT DateEntered,Count(ID) AS Total FROM Applications WHERE 1 GROUP BY DATE_FORMAT(DateEntered,"%Y%v")

if that's not quite what you are looking for, then it starts getting more complicated
0
 

Author Comment

by:aberns
ID: 21875718
What I'm looking for is a total by 7 day intervals...so for example, the output would look like

DateRange Total
2008-01-01 - 2008-01-06: 145
2008-01-07 - 2008-01-13: 98
2008-01-14-2008-01-20: 123

And so on.....

Is there a way to Automatically Count and Group By every 7 days for a set number of weeks?
0
 

Author Comment

by:aberns
ID: 21875841
oh wait a minute...I just tried your query again and it works! I never knew about the %v parameter in DATE_FORMAT. Thanks......
0
Enterprise Mobility and BYOD For Dummies

Like “For Dummies” books, you can read this in whatever order you choose and learn about mobility and BYOD; and how to put a competitive mobile infrastructure in place. Developed for SMBs and large enterprises alike, you will find helpful use cases, planning, and implementation.

 
LVL 20

Expert Comment

by:virmaior
ID: 21875864
did you look at what  the query does?

It aggregates by year and week.  A week is 7 days long.


if you have specific date ranges and know them, then you could do this:

CREATE TABLE IF NOT EXISTS `trick_table` (
  `trick_id` bigint(20) NOT NULL,
  `start_date` datetime NOT NULL,
  `end_date` datetime NOT NULL,
  PRIMARY KEY  (`trick_id`)
) ENGINE=MyISAM

INSERT INTO `trick_table` (start_date,end_date)
VALUES ('2008-01-01','2008-01-06') ....

SELECT (SELECT COUNT(ID) FROM applications WHERE DateEntered Between tt.start_date AND tt.end_date ) FROM trick_table tt
0
 

Author Comment

by:aberns
ID: 21876003
Yes, at first I didn't look carefully enough...but then realized that it aggregated by a week for a year. Thanks for your follow up.
Audrey
0
 
LVL 20

Expert Comment

by:virmaior
ID: 21876023
no problem
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Developers of all skill levels should learn to use current best practices when developing websites. However many developers, new and old, fall into the trap of using deprecated features because this is what so many tutorials and books tell them to u…
This article shows the steps required to install WordPress on Azure. Web Apps, Mobile Apps, API Apps, or Functions, in Azure all these run in an App Service plan. WordPress is no exception and requires an App Service Plan and Database to install
Learn how to match and substitute tagged data using PHP regular expressions. Demonstrated on Windows 7, but also applies to other operating systems. Demonstrated technique applies to PHP (all versions) and Firefox, but very similar techniques will w…
The viewer will learn how to dynamically set the form action using jQuery.

737 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