I need to fetch the highest value from a mysql db column. It's a timestamp. Using mysql MAX function it's not working, bellow you can see the code:
//Create new db object
$db = new Db();
//Query
$qr_changelog = $db->query("
SELECT MAX(log_datetime) FROM ca_change_log
");
//Fetch result
$last_change = $qr_changelog->get('log_datetime');
//Print result
echo "Last Change:" . $last_change;
If I run the query without MAX function it works (but obviously returns all values). If I run the query from mysql server console it works. Apache log shows no errors.
I also tried with mysqli:
$db1 = new mysqli('localhost', 'user', 'passwd', 'db');
if($db1->connect_errno > 0){
die('Unable to connect to database [' . $db1->connect_error . ']');
}
$qr_changelog = $db1->query("
SELECT MAX(log_datetime) FROM ca_change_log");
while($row = $qr_changelog->fetch_assoc()){
echo $row['log_datetime'] . '<br />';
}
Any ideas?
You can order the SQL and limite the value if You Sant the max value. Something like this: SELECT log_datetime FROM ca_change_log order by log_datetime dec limite (1)
.
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