having problem with MAX (column_name) syntax

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hi guys i am having problem in selecting the maximum of number of a column called booking id, in a 'booking' table

i wrote my sytax like this

PHP

<?php

include 'configuration.php';

$sql= mysql_query("select max(booking_id) from booking ");

if(!$sql){echo "syntax error";}else{

while($row = mysql_fetch_array($sql)){

        $booking_id = $row['booking_id'];

        echo $booking_id;
    }
}



?>

but it is giving me an error like this ...
( ! ) Notice: Undefined index: booking_id in C:\wamp\www\airlines\test.php on line 11
Call Stack
# Time Memory Function Location
1 0.0009 324472 {main}( ) ..\test.php:0

Posted 7-Mar-15 1:17am

@sunusi1

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Comments

Mohibur Rashid 7-Mar-15 10:06am

You are getting this error because your index is "max(booking_id)". Two ways of getting out of this error,
1. using max(booking_id) as index or assigning an alternative name for your column. ie "select max(booking_id) as booking_id from booking "
2. as Peter leow said

1 solution

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Peter Leow · Accepted Answer · 2015-03-07T01:57:00

Solution 1

There is no need for while loop as you are expecting one result only for the max booking_id, And you are expecting array, use index to get the result will do.

$row = mysql_fetch_array($result);
$booking_id = $row[0];
echo $booking_id;

Posted 7-Mar-15 1:57am

Peter Leow

Updated 7-Mar-15 1:58am

v2