Not echoing a mysql query result

Question

Not echoing result, I think because result is a sum and not a specific entry in the db?

<?PHP
error_reporting('E_ALL');
include('session.php');
include('config.php');
$sql="SELECT SUM(grading) FROM (SELECT * FROM 'trails' WHERE `name` = 'Free Flow' ORDER BY `id` DESC LIMIT 5) AS DATA";
$result = mysql_query($sql);
while($row = mysql_fetch_array($result)) {
echo $row['grading'];
}
?>

Updated version giving lank page...

<?PHP
error_reporting(E_ALL);
include('session.php');
include('config.php');
$sql="SELECT SUM(grading) AS grading FROM (SELECT * FROM `trails` WHERE `name` = "Free Flow" ORDER BY `id` DESC LIMIT 5) AS DATA";
$result=mysql_query($sql);
while($row=mysql_fetch_array($result)) {
echo $row['grading'];
}
?>

`SELECT SUM(grading) as grading` before using in the row index. — Abhik Chakraborty, Jul 08 '14 at 11:52
Are you sure there's no error being reported here? Check your PHP logs. — David, Jul 08 '14 at 11:52
Apart from the right solution written from @AbhikChakraborty - ``error_reporting(E_ALL);`` instead of ``error_reporting('E_ALL');``. ``E_ALL`` is a constant. — thedom, Jul 08 '14 at 11:54
Abhik, please elaborate? David no error is being thrown.. Query gives correct result in phpmyadmin. — user1287814, Jul 08 '14 at 11:57
And you shouldn't use mysql_* functions because they are deprecated. Visit this [link](http://stackoverflow.com/questions/12859942/why-shouldnt-i-use-mysql-functions-in-php) for more information — Giulio De Marco, Jul 08 '14 at 12:05
Thanks so much guys been struggling with this for hours.. much appreciated, all of you.. :D — user1287814, Jul 08 '14 at 12:11

score 1 · Answer 1 · edited Jun 20 '20 at 09:12

Identifiers may begin with a digit but unless quoted may not consist solely of digits.

Database, table, and column names cannot end with space characters.

Database and table names cannot contain “/”, “\”, “.”, or characters that are not permitted in file names.

The identifier quote character is the backtick (“`”):

Remove apostrophes after FROM (i mean FROM 'trails') and replace with backticks " ` ".

Your sql query would then look like this:

$sql="SELECT SUM(`grading`) as `grading`
      FROM (SELECT * FROM `trails` WHERE `name` = 'Free Flow'
      ORDER BY `id` DESC LIMIT 5) AS DATA";

Source: Schema Object Names

score 0 · Answer 2 · answered Jul 08 '14 at 11:57

0

Make sure that you connection is successfully connected, SQL query is correct, database table has entries and you are using correct column name to print like $row['grading'].

answered Jul 08 '14 at 11:57

Saeed Afzal

368
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5
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NPlay · Answer 3 · 2014-07-09T19:59:59.747

0

The problem comes from :

error_reporting('E_ALL');

'E_ALL' isn't the constant, it's a string. PHP will silently cast it to int, and make it the configuration value for error reporting.

 (int) 'E_ALL' == 0

error_reporting(0) hide all errors, that's why you got a blank page.

edited Jul 09 '14 at 19:59

answered Jul 08 '14 at 11:58

NPlay

108
1
6

score 0 · Accepted Answer · answered Jul 08 '14 at 12:00

0

You have to create an index to SUM, so:

SELECT SUM(grading) AS sum_grading FROM (SELECT * FROM trails WHERE `name` = 'Free Flow' ORDER BY `id` DESC LIMIT 5) AS DATA

And then:

echo $row['sum_grading']

answered Jul 08 '14 at 12:00

pavel

26,538
10
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Not echoing a mysql query result

4 Answers4