MySQL Date calculation using order by

Last update on August 19 2022 21:51:24 (UTC/GMT +8 hours)

Date calculation using order by

In this page, we have discussed how to perform MySQL date calculation using ORDER BY.

Example:

Sample table: publisher

Code:

SELECT pub_name, estd, CURDATE(),
(YEAR(CURDATE())-YEAR(estd))
- (RIGHT(CURDATE(),5)<RIGHT(estd,5))
AS Age
FROM publisher
ORDER BY pub_name;

Explanation:

It will be easy to examine the age of the publisher because an ORDER BY clause have been added which will sort the publisher in ascending order.

Sample Output:

mysql> SELECT pub_name, estd, CURDATE(),
    -> (YEAR(CURDATE())-YEAR(estd))
    -> - (RIGHT(CURDATE(),5)>RIGHT(estd,5))
    -> AS Age
    -> FROM publisher
    -> ORDER BY pub_name;
+------------------------------+------------+------------+------+
| pub_name                     | estd       | CURDATE()  | Age  |
+------------------------------+------------+------------+------+
| BPP Publication              | 1985-10-01 | 2015-04-01 |   29 | 
| Jex Max Publication          | 1969-12-25 | 2015-04-01 |   45 | 
| Mountain Publication         | 1975-01-01 | 2015-04-01 |   40 | 
| New Harrold Publication      | 1975-09-05 | 2015-04-01 |   39 | 
| Novel Publisher Ltd.         | 2000-01-01 | 2015-04-01 |   15 | 
| Pieterson Grp. of Publishers | 1950-07-15 | 2015-04-01 |   64 | 
| Summer Night Publication     | 1990-12-10 | 2015-04-01 |   24 | 
| Ultra Press Inc.             | 1948-07-10 | 2015-04-01 |   66 | 
+------------------------------+------------+------------+------+
8 rows in set (0.02 sec)

Note: Since Current date is one of the aspects to achieve the output, your output and output from the PHP script may differ from the above output.

PHP script:

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>example-date-calculation-using-order-by - php mysql examples | w3resource</title>
<meta name="description" content="example-date-calculation-using-order-by - php mysql examples | w3resource">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-12">
<h2>List of publishers with date of establishment, current date of establishment and how old their publishing houses are. The list is sorted against the name of the publisher:</h2>
<table class='table table-bordered'>
<tr>
<th>Publisher's name</th><th>Date of establishment</th><th>Current date</th><th>AGE</th>
</tr>
<?php
$hostname="your_hostname";
$username="your_username";
$password="your_password";
$db = "your_dbname";
$dbh = new PDO("mysql:host=$hostname;dbname=$db", $username, $password);
foreach($dbh->query('SELECT pub_name, estd, CURDATE(),
(YEAR(CURDATE())-YEAR(estd))
- (RIGHT(CURDATE(),5)<RIGHT(estd,5))
AS Age
FROM publisher
ORDER BY pub_name') as $row) {
echo "<tr>";
echo "<td>" . $row['pub_name'] . "</td>";
echo "<td>" . $row['estd'] . "</td>";
echo "<td>" . $row['CURDATE()'] . "</td>";
echo "<td>" . $row['Age'] . "</td>";
echo "</tr>";
}
?>
</tbody></table>
</div>
</div>
</div>
</body>
</html>

View the example in browser

MySQL Date calculation with order by descending order:

Date calculation:

In the following we have discussed how to sort the column after performing MySQL date calculation by descending order.