Sort results by number of using

[eluser]someone [/eluser]
Hello!

I would like to create model's function which will shows most used categories. I have two tables - news and categories.

Table news: ID_article, title, content, date, ID_category, url
Table categories: ID_category, title, description, url

So this function must get number of using for each inserted category and this must be limited with 5.

Like this output:
Number of using | Name | Description
23 First First category
21 Second Second category
8 Third Third category

Thanks for help!

[eluser]InsiteFX[/eluser]

Code:

$this->db->order_by("column", "desc");

[eluser]aquary[/eluser]
You'll need a query to count number of news in each category, then sort it by the count... though this might be slow when your table got bigger...

Code:

// convert it to CI's AR yourself.
SELECT categories.*, COUNT(categories.ID_category) AS usage_time FROM categories JOIN news ON news.ID_category=categories.ID_category ORDER BY count(categories.ID_category) limit 5;

Not tested but something along that line. However, this is only limited to categories with at least 1 news inside. Empty categories will not be shown.

[eluser]someone [/eluser]
Thanks for query, but I haven't ever working with SQL in this way. Could someone please help me to convert this to CI's AR?

Thanks! :-)

[eluser]someone [/eluser]
Please help!

Thanks! :-)