charts.js help needed

I m creating chart using http://www.chartjs.org This is as per my client requirements.

So in chart i gotta display no of products in each category.
Products & Categories are created from dataassist So i believe the DB structure is well known to all here.

So i want to know what will be the fastest & easiest way to display this.

Currently i created RS of each ProductCategory ex:
$query_A = "SELECT CatID FROM Products WHERE CatID = 1";
$query_B = "SELECT CatID FROM Products WHERE CatID = 2";
& so on.. then using value: <?php echo $totalRows_A ?>,

So this is making me create tooo many RS.

So if clients add new category i don't want to manually add rs to each pages.

So how can this be done auto?
There must be a simple & easy way. i m not able to fix it. Please advise.

SELECT CatID, Count(*) AS CatCount FROM Products GROUP BY CatID

So how to display total number of 1st record in category?
Lets say i want to display total numbers of product of category named "xyz". Lets say there are 25 products under that category. so want to display total no as 25.

Then lets say category named "abc" has 10 products. then i want to display 10.

So how to do this?

Loop through the recordset. There will be one row for each category. You can add an INNER JOIN to get the category name.

Products Table:

ID, Name, CatID

Categories:

ID, CatName

Products List:

1 , Iphone, 1
2, Samung s3, 1
3, Mac book , 2
4, Apple Headphone, 3

Categories:

1, Mobiles
2, Laptop
3, Headsets

So as above Records lets say i want to display:
No of Mobiles:
No of laptops:
No of Headsets:

SELECT CatName, Count(*) AS CatCount FROM Products INNER JOIN Categories ON Categories.ID = Products.CatID GROUP BY CatID

Then add a repeated region on the page and you can display the CatName and CatCount for each of the categories.

Awesome it does display Total Nos. How about display CatName as well?

just like:

Mobiles 2
Laptops 1
Headphone 1

The SQL already has the CatName in it... you can add whatever other columns you want.

Oh ok. How about if i want to exclude a data of category ie Mobiles..

Just like:
Laptops 1
Heaphone 1..

Like WHERE NOT ( '1')

Just add a WHERE clause before the GROUP BY like:

SELECT CatName, Count(*) AS CatCount FROM Products INNER JOIN Categories ON Categories.ID = Products.CatID WHERE Categories.ID <> 1 GROUP BY CatID