Question

I have two tables as follows:

Customer | Product
------------------
    A    |   Car
    A    |  Bike
    A    |  Boat
    B    |   Foo
    B    |   Bar

Customer | Friends
------------------
    A    |   John
    A    |  Andrew
    B    |   Baz

For each customer I want to display a list of products purchased, and a list of friends like this:

Customer   Products    Friends
------------------------------
A       - Car       - John
        - Bike      - Andrew
        - Boat
------------------------------
B       - Foo       - Baz
        - Bar     

If I use a normal JOIN then I get a list of friends for every separate product. I just want the two lists once.

The output lists with ‘-‘ need not be table cells, they can be <ul>s.

How can I achieve this? I would like to bind to ASP.net GridView. Should I try to do it all in one query, or use multiple queries and somehow add them both to the same Grid?

---

Each row actually forms part of a long report. Essentially each row of the report contains Customer ID, a bunch of other fields which match one-to-one with Customer ID, then the two lists for each Customer ID I described. Perhaps I can use a separate query for each list, then manually add each list to the grid on RowDataBound or similar?

Answer 1

You need 2 separate queries since you just want the list of data in 2 tables (with same where condition)

What SQL engine are you using?