Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

PHP MYSQL: How to retreive (1) latest date, (2) value associated with latest date, (3) largest value (4) lowest value?

Posted on 2008-06-11
3
Medium Priority
?
640 Views
Last Modified: 2013-12-13
PHP MYSQL

Hello,

I have a MySQL database table I want to retrieve data from.

The format is
[ Date ] [ Value ]

I want to retrieve 4 things from the table:
1. The latest date (call it $latest_date)
2. The value associated with the latest date (call it $latest_value)
3. The highest value in the column Value (call it $max_value)
4. The lowest value in the column Value (call it $min_value)


How do I write in my PHP script a MySQL query to retrieve those 4 things?


Thanks.
0
Comment
Question by:gingera
[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
3 Comments
 
LVL 9

Expert Comment

by:Rob Siklos
ID: 21761180
Here's the SQL:

1 and 2:
  SELECT `Value`, `Date`
  FROM table
  HAVING `Date` = MAX(`Date`)

3:
  SELECT MAX(`Value`) FROM table

4:
  SELECT MIN(`Value`) FROM table
0
 
LVL 9

Accepted Solution

by:
Rob Siklos earned 2000 total points
ID: 21761234
so in PHP, you can do it like this:

// 1 and 2
$sql = "SELECT `Value`, `Date`
  FROM table
  HAVING `Date` = MAX(`Date`)";
 
$result = mysql_query($sql);
$row = mysql_fetch_assoc($result);
$latest_date = $row['Date'];
$latest_value = $row['Value'];
 
// 3 and 4
$sql = "SELECT MAX(Value) AS maxval, MIN(Value) AS minval FROM table";
$result = mysql_query($sql);
$row = mysql_fetch_assoc($result);
$max_date = $row['maxval'];
$min_value = $row['minval'];

Open in new window

0
 

Author Closing Comment

by:gingera
ID: 31466195
THANKS
0

Featured Post

What Is Blockchain Technology?

Blockchain is a technology that underpins the success of Bitcoin and other digital currencies, but it has uses far beyond finance. Learn how blockchain works and why it is proving disruptive to other areas of IT.

Question has a verified solution.

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

Many old projects have bad code, but the budget doesn't exist to rewrite the codebase. You can update this code to be safer by introducing contemporary input validation, sanitation, and safer database queries.
By, Vadim Tkachenko. In this article we’ll look at ClickHouse on its one year anniversary.
The viewer will learn how to look for a specific file type in a local or remote server directory using PHP.
In this video, Percona Solution Engineer Rick Golba discuss how (and why) you implement high availability in a database environment. To discuss how Percona Consulting can help with your design and architecture needs for your database and infrastr…

704 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