php mysql total sum two tables - php

Question

When someone selects a service number, then it will pop down and only give the total one records. I want it to give to total from two tables..
<?php
$qry = mysql_query ("SELECT SUM(fruit) AS total FROM fruitinventory WHERE `fruitcolor` LIKE '%{$_POST['select']}%'");
$row2 = mysql_fetch_assoc($qry);
echo $row['total'];
?>
<?php
$qry = mysql_query ("SELECT SUM(fruitsmart) AS total FROM fruitrotten WHERE `fruitcolor` LIKE '%{$_POST['select']}%'");
$row = mysql_fetch_assoc($qry);
echo $row['total'];
?>
Then
I want the total of both rows to display then too.
<?php
$total return = $row+$row2
?>

Answer 1

You can consolidate your two database calls into a single query, and use the columns of the result as your variables to echo out:
<?php
$input = mysql_real_escape_string($_POST['select']);
$sql = "
SELECT
(
SELECT SUM(fruit)
FROM fruitinventory
WHERE fruitcolor LIKE '%$input%'
) AS totalfruit,
(
SELECT SUM(fruitsmart)
FROM fruitrotten
WHERE fruitcolor LIKE '%$input%'
) AS totalfruitsmart";
$qry = mysql_query($sql);
$row = mysql_fetch_assoc($qry);
echo $row['totalfruit'] . '<br />';
echo $row['totalfruitsmart'] . '<br />';
echo $row['totalfruit'] + $row['totalfruitsmart'];
?>
Please, at the very minimum, use mysql_real_escape_string() to help prevent against SQL injection attacks which is what your original code was wide open to.

Answer 2

Assuming you want to keep that same sort of structure for you code, you can display a total like so (Note: MySQLi (i = improved) functions should be used as MySQL functions are deprecated):
<?php
$qry = mysqli_query ("SELECT SUM(fruit) AS total FROM fruitinventory WHERE `fruitcolor` LIKE '%{$_POST['select']}%'");
$row2 = mysqli_fetch_assoc($qry);
echo $row2['total'];
$qry = mysqli_query ("SELECT SUM(fruitsmart) AS total FROM fruitrotten WHERE `fruitcolor` LIKE '%{$_POST['select']}%'");
$row = mysqli_fetch_assoc($qry);
echo $row['total'];
$total = $row['total'] + $row2['total'];
echo $total;
?>
Since it will come up, I suggest you look at using PDO instead of the mysql_ (or at least wrap mysqli_real_escape_string around your variables) to protect your database.

Answer 3

You can try to do the sum using only SQL. Something like below:
$qry = mysql_query ("
SELECT (
( SELECT SUM(fruit) AS total FROM fruitinventory WHERE `fruitcolor` LIKE '%{$_POST['select']}%' ) +
( SELECT SUM(fruitsmart) AS total FROM fruitrotten WHERE `fruitcolor` LIKE '%{$_POST['select']}% )
) AS total") ;
$row = mysql_fetch_assoc($qry);
echo $row['total'];