Question

I am working to implement a data connection between my C# application and a SQL Server Express database. Please bear in mind I have not worked with SQL queries before.

I have the following relevant tables:

ArticlesCommon
ArticlesLocalized
CategoryCommon
CategoryLocalized

The ArticlesCommon table holds language independent information such as price, weight etc.

This is the statement for now:

SELECT * 
    FROM ArticlesCommon 
    INNER JOIN ArticlesLocalized ON ArticlesCommon.ID = ArticlesLocalized.ID 
WHERE ArticlesLocalized.Language = @language
ORDER BY ArticlesCommon.DateAdded

ArticlesCommon contains a category id for each row. Now, I want to use this to look up the localized information in CategoryLocalized and add it to the result, something like

SELECT *, CategoryLocalized.Name as CategoryName.

If I have gotten my point across, is this doable?

Edit:

Another question though. Both ArticlesLocalized and ArticlesCommon contain ID, which naturally are the same. I want to select everything from ArticlesCommon but everything except ID from ArticlesLocalized.. Is there a concise way to achieve this?

I guess that

SELECT * FROM …..

yield all columns from all joined tables?

Answer 1

Just add another Join

SELECT * FROM ArticlesCommon c 
   JOIN ArticlesLocalized L
       ON  a.ID = L.ID  
   JOIN CategoryLocalized CL
       ON  CL.ID = c.CategoryID  
WHERE ArticlesLocalized.Language = @language 
ORDER BY ArticlesCommon.DateAdded 

Use outer joins if not every row in ArticlesCommon has a CategoryId

SELECT * FROM ArticlesCommon c 
   JOIN ArticlesLocalized L
       ON  a.ID = L.ID  
   Left [OUTER] JOIN CategoryLocalized CL
       ON  CL.ID = c.CategoryID  
WHERE ArticlesLocalized.Language = @language 
ORDER BY ArticlesCommon.DateAdded 

• [OUTER] is optional, as [Left] implies OUTER