SQL select output to XML - sql

Question

Trying to do a select in SQL Server 2005 and send the output to xml. Table 2 is a general use table with various types of info. Some product info is in there if it's type 2, it's a sales lead if it's type 1. We can have multiple sales leads and products for each case_num from table 1.
Table 1
case_num,
date
table 2 (general use)
case_num,
rec_type (1=sales lead; 2=product),
various info based on type in generic columns =
col_a,
col_b,
I'm trying something like:
select
case.case_num
,case.date
,product.col_a as product_name
,product.col_b as product_price
,lead.col_a as sales_lead_name
,lead.col_b as sales_lead_address
from
table_1 case
,table_2 product
,table_2 lead
where
(case.case_num = product.case_num AND product.rec_type = 2)
OR
(case.case_num = lead.case_num AND lead.rec_type = 1)
for xml auto, elements
This is bringing back results like
<case>
<case_num>1</case_num>
<date>1/1/2013</date>
<product>
<product_name>name</product_name>
<product_price>1.00</product_price>
<lead>
<sales_lead_name>bob smith</sales_lead_name>
<sales_lead_address>address 1</sales_lead_address>
</lead>
</product>
<product>
<product_name>name2</product_name>
<product_price>2.00</product_price>
<lead>
<sales_lead_name>bob smith</sales_lead_name>
<sales_lead_address>address 1</sales_lead_address>
</lead>
</product>
</case>
I don't want the name repeating for every product. With multiple products and multiple leads, how do I format the SQL so it doesn't make sort of a Cartesian product in my results?
I made another example to illustrate my problem. SQL Fiddle example
This is making a cartesian result, matching all parts to all persons. I want to have one case then each part then each person, then close case.
I was trying DISTINCT and getting errors. I thought about UNION to tie two together, but I don't think I can do that within a bigger select for my case.
What I’m getting:
CASE_NUM DATE PART_NAME PART_PRICE PERSON_NAME COMPANY
1 2013-01-01 stapler 1.00 bob smith acme supplies
1 2013-01-01 matches 2.00 bob smith acme supplies
1 2013-01-01 stapler 1.00 john doe john supply inc
1 2013-01-01 matches 2.00 john doe john supply inc
What I want:
CASE_NUM DATE PART_NAME PART_PRICE PERSON_NAME COMPANY
1 2013-01-01 bob smith acme supplies
1 2013-01-01 john doe john supply inc
1 2013-01-01 matches 2.00
1 2013-01-01 stapler 1.00

Answer 1

As #marc_s points out, you create your Cartesian product yourself by 'joining' the tables the way you do. Always try to use JOIN instead.
I believe the following query would fit you needs:
select
[case].case_num
,[case].date
,lead.col_a as sales_lead_name
,lead.col_b as sales_lead_address
,product.col_a as product_name
,product.col_b as product_price
from
table_1 [case]
JOIN table_2 lead ON [case].case_num = lead.case_num
AND lead.rec_type = 1
JOIN table_2 product ON [case].case_num = product.case_num
AND product.rec_type = 2
FOR XML auto, elements;
You can view it on SQLFiddle.com
The output will look like this:
<case>
<case_num>1</case_num>
<date>2013-01-01</date>
<lead>
<sales_lead_name>bob smith</sales_lead_name>
<sales_lead_address>address 1</sales_lead_address>
<product>
<product_name>name</product_name>
<product_price>1.00</product_price>
</product>
<product>
<product_name>name2</product_name>
<product_price>2.00</product_price>
</product>
</lead>
</case>

Answer 2

A friend suggested only joining once, then filtering the select based on case statements and I think this is going to work. Thanks folks
select case_num = case
when child.rec_type = '1' then mast.case_num
when child.rec_type = '2' then mast.case_num
else '' end
,mast_date = case
when child.rec_type = '1' then mast.date
when child.rec_type = '2' then mast.date
else '' end
,child.rec_type
,part_name = case when child.rec_type = '1' then child.col_a else '' end
,part_price = case when child.rec_type = '1' then child.col_b else '' end
,subject_name = case when child.rec_type = '2' then child.col_a else '' end
,subject_type = case when child.rec_type = '2' then child.col_b else '' end
from table_master mast
join table_child child on mast.case_num = child.case_num
--for xml auto, elements;

Answer 3

Since no one has answered the question I have done something similar in the past I cant exactly remember how I did it but I will give you something to play with its really hard to guess things when you dont have data available , as far as I remember I did something like this to get the format you are after and it was on SQL Server 2005 so it should work for you
select case.case_num, case.date,
(SELECT col_a [#productname]
,col_b [#productprice]
FROM table_2 t2
WHERE t2.case_num = case.case_num
FOR XML PATH('Details'), TYPE)
from table_1 case
FOR XML PATH('Case'), ROOT('Cases')