Help with concept - filters and number of items

Posted by dreamer on Stack Overflow See other posts from Stack Overflow or by dreamer
Published on 2010-06-14T10:20:36Z Indexed on 2010/06/14 10:42 UTC
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c#

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ASP.NET

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sql-server

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asp.net-mvc

Please check http://www.alibaba.com/catalogs/cid/702/Laptops.html they have nice filter here with number of items for each. Note one detail - they have locations here. Same thing on olx.com - location and number of items for each category.

Now imagine I have tables: [products] (Id, Name, CategoryId, LocationId) [Categories] (Id,Name) [Location] (Id, Name)

My question how can I do the same, cause count things even with caching looks expensive? And they give results pretty fast...

Please advice with possible ways to do that in ASP.NET, C#, MVC, MS SQL, but avoice simple answers like "count and change" Thank you in advance.

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