Solved

A daily price table

Posted on 2004-09-22
7
356 Views
Last Modified: 2006-11-17

I am quite new to mysql, but I'm studing... Now I need to display in html several
"monthly" tables like this one:

==============================================
January 2005


      Rev      1      2      3      4      5      6......................31

PROD1        1      xxx      xxx      xxx      xxx      xx      xx            xxx
PROD1        2      xxx      xxx      xxxx      xx      xx      xx      x      xxx      
PROD3   1      ..      ..      ..
PROD4      1      ..      ..      ..      ..
PROD4   2        ...      ..      ..      ..      ..
...
...
PROD12  1      ..      ..            ..      ..            ...
==================================================

We can assume that is a daily price-table for 12 products. Some product can also have a Rev.1 or Rev.2
I am very doubtful concerning the best method to create the table with mysql and the select
to display such matrix ....
The user should then be able to change partial data, such as prices in a week or in two days..
 
0
Comment
Question by:winmeister
  • 4
  • 3
7 Comments
 
LVL 33

Expert Comment

by:snoyes_jw
ID: 12128056
How often does the price change?
0
 
LVL 1

Author Comment

by:winmeister
ID: 12128107
Not very often. Let's say that an administrator has to fill the table just once a month, then he can make very few adjustments during the month.
0
 
LVL 33

Expert Comment

by:snoyes_jw
ID: 12128129
You could do something like this:
productId/date/price
prod1/01Jan/$1
prod1/02Jan/$3
prod1/03Jan/$4
You'll have ~350 rows per month, which is no problem.  If price changes are infrequent, you could simply store the day that the change was made, and use your programming language of choice to repeat that price until another change occurs.  Then you will only have 12 + numberChanges rows per month.
0
NFR key for Veeam Backup for Microsoft Office 365

Veeam is happy to provide a free NFR license (for 1 year, up to 10 users). This license allows for the non‑production use of Veeam Backup for Microsoft Office 365 in your home lab without any feature limitations.

 
LVL 1

Author Comment

by:winmeister
ID: 12130940
Yes, that could be good. You forgot the "revision" field, but I believe I can simply add: prodid/rev/date/price. No primary key, as I do not have a unique field...
 Let's assume I will work with the plain table (350 rows or more), how can I display the table data in the matrix form I have shown in my original question?
0
 
LVL 33

Accepted Solution

by:
snoyes_jw earned 100 total points
ID: 12132571
You can make (prodid, rev) a primary key.

It would be easiest and best to display using scripting language of your choice - PHP, ASP, whatever.  The general algorithm:

query for rows in given month ordered by productId
for each queried row in record set {
  if(productVariable != row[productId]) {
    productVariable := row[productId]
    print new line
    print productId
  }
  print price
}
0
 
LVL 1

Author Comment

by:winmeister
ID: 12132896
As you are a PHP-master, can you suggest those lines in PHP?
0
 
LVL 33

Expert Comment

by:snoyes_jw
ID: 12134147
$sql = "SELECT * FROM theTable WHERE theDateField BETWEEN '2005-01-01' AND '2005-01-31' ORDER BY productId;
$result = mysql_query($sql) or die(mysql_error());

while ($row = mysql_fetch_assoc($result)) {
  if ($productId != $row['productId'] || $revNum != $row['revNum']) {
    $productId = $row['productId'];
    $revNum = $row['revNum'];
    echo "\n";
    echo "$productId Rev. $revNum\t";
  }
  echo $row['price'] . "\t";
}

Obviously, if this is for a web page, you'd replace the \n with <br/> or </tr> and the \t with </td>
0

Featured Post

What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

Question has a verified solution.

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

Suggested Solutions

I use MySQL for many of my development projects in a Windows environment. To manage my databases (and perform queries) for years I used a tool called MySQL administrator.  This tool has since been replaced by MySQL Workbench. So I decided to m…
Does the idea of dealing with bits scare or confuse you? Does it seem like a waste of time in an age where we all have terabytes of storage? If so, you're missing out on one of the core tools in every professional programmer's toolbox. Learn how to …
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

685 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