Debugging some php

I have a file called the [url removed, login to view] that pulls all similar values within a table along with another summed value, in this case called revenue, and then allows the user to sort either of them in ascending or descending order. It doesn't work and has two problems. The first is that the first column, 'company', is by default pulled up in ascending order. It can be sorted in descending order and back into ascending order, and then stops working. The second column, 'revenue', doesn't work at all and gives the following message when the user tries to sort it; PHP Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in D:\hshome\prent327\[url removed, login to view]\[url removed, login to view] on line 63 PHP Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource in D:\hshome\prent327\[url removed, login to view]\[url removed, login to view] on line 69 I would like both of these problems fixed. I'll attach the [url removed, login to view] file and this is a sample link so you can see the page at work - [url removed, login to view] Thanks.

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Ingeniería MySQL PHP Arquitectura de software Verificación de software

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