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troubleshooting Question

MSSQL Joins - how to join 3 tables and return all rows even if null

Avatar of Jamie
JamieFlag for United Kingdom of Great Britain and Northern Ireland asked on
Microsoft SQL ServerASP
11 Comments1 Solution543 ViewsLast Modified:
Hi All,

I'm getting in a right muddle trying to work this out, hence my need for your help.

I have 3 tables:

1. Products ~ List of products
2. Categories ~ List of category names
3. ProCategories ~ List of products (1) in which category (2) - this holds only id numbers.

I need t-sql script, which will be used via asp to list all products and the categories they are in - and also the categories they are not in - including the category name, which can only be obtained from table 2. I want to be able to filter by product name also.

My feeble effort so far;

select p.cname, c.catdescription  from products as p,categories as c, prodcategories as pc
where pc.intcatalogid = p.catalogid
and   pc.intcategoryid = c.categoryid
and p.cname like '%yellow%'

Looking for something like

Product         Category       ProdCategory
Apple            Fruit               Exists
Apple            Green            Exists
Apple            Vegetable     NULL                

Many thanks

Jamie



 
ASKER CERTIFIED SOLUTION
Avatar of Shaun Kline
Shaun KlineFlag of United States of America imageLead Software Engineer

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