# Calculating a new interim value and then sorting by the new value

Experts,

I have a table 'myTable' in a database with columns 'xxx' and 'yyy'. I would like to calculate a new column 'rating' based on some conditional statements and then sort the record set using the new column.

At the moment, I call the record set and store the values in PHP variables, then use the following PHP conditional statements to assign the rating:
``````<?php
/*
///////////////////////
// CALCULATE  RATING //
///////////////////////
*/

if(isset(\$xxx)&&isset(\$yyy)){
if(\$xxx>10&&\$yyy>100){\$rating=5;}
elseif(\$xxx>7&&\$yyy>100){\$rating=4;}
elseif(\$xxx>10&&\$yyy>70){\$rating=4;}
elseif(\$xxx>7&&\$yyy>70){\$rating=3;}
elseif(\$xxx>3&&\$yyy>70){\$rating=3;}
elseif(\$xxx>7&&\$yyy>30){\$rating=2;}
elseif(\$xxx>3&&\$yyy>70){\$rating=2;}
else{\$rating=1;}
}else{
echo "ERROR: Cant caclulate rating - arguments missing";
\$msg="ERROR: Cant caclulate rating - arguments missing";
\$rating=0;
}
?>
``````

The rating is then output to the screen.

This approach is ok, but it doesnt allow me to sort the information by this new rating value. Could someone suggest a method that i might use (preferably supply the SQL statement) to enable this operation to be processed by the MySQL statement?

Regards
Dean
LVL 12
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SELECT xxx, yyy,
CASE
WHEN xxx > 10 AND yyy > 1000 THEN 5
WHEN xxx > 7 AND yyy > 100 THEN 4
WHEN xxx > 10 AND yyy > 70 THEN 4
WHEN xxx > 7 AND yyy > 70 THEN 3
WHEN xxx > 3 AND yyy > 70 THEN 3
WHEN xxx > 7 AND yyy > 30 THEN 2
WHEN xxx > 3 AND yyy > 70 THEN 2
ELSE 1
END AS rating
FROM myTable
0

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Commented:
You can create calculated fields in SQL Server, and then do things like order queries on the table by the value in a calculated field.

Here's a very simple table to try playing with:

``````CREATE TABLE [dbo].[__MyTest](
[id] [int] NULL,
[one] [int] NULL,
[two] [int] NULL,
[sum]  AS ([one]+[two]) PERSISTED,
[product]  AS ([one]*[two]) PERSISTED
) ON [PRIMARY]
``````

Fill in the first two fields and then check out what you get - like this:
``````insert into __MyTest (id, one, two) select 1, 2, 4
select * from __MyTest
``````

hth

Mike
0
Commented:
If you can't get the results in the SQL query, the theory and practice here may be helpful.
http://www.experts-exchange.com/articles/18319/Using-PHP-usort-to-Simplify-Complex-Data-Search.html
0
Author Commented:
Thanks to everyone for their contributions.

Brian's solution did the trick perfectly.

Regards
Dean
0
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