Question

I have created a the following view in my Database after combining multiple tables. A select * from MYViEW gives the following result below.

ProductID | TechID | ContactID | Priority | FIRSTNAME | MIDDLEINI | LASTNAME | 
1123         2406       1371        1        Pradeep       X          Nayak      
1123         2406       1368        2        Hello         W          World      
1123         2406       1363        3        Foo           Y          World    
1299         2279       1208        2        Some          Z          Dude     

And I need the OUTPUT result to below to be displayed:

ProductID | TechID | ContactID | Priority | FIRSTNAME | MIDDLEINI | LASTNAME | Buyers                                        |
1123         2406       1371        1        Pradeep    X           Nayak      Nayak, Pradeep X; World, Hello W; World, Foo Y  
1299       2279         1208        2        Some       Z           Dude       Dude, Some Z

For every Product ID and Tech ID have a single record, and all the Buyers must be combined in a column in the format LastName, FirstName MiddleIni and each name separated by a space. I have already tried to use the custom aggregate function from here for combing the results to a single column. Please let me know if you can help me with a query for this.

Answer 1

This will display the data in the manner than you want:

select t1.ProductID,
  TechId,
  x.ContactID,
  x.Priority,
  FirstName,
  MiddleIni,
  LastName,
  stuff((select  '; ' + lastname + ', ' + FIRSTNAME + ' ' + MIDDLEINI
          from yourtable t2
          where t2.productid = t1.productid
        FOR XML PATH('')), 1, 1, '') 
from yourtable t1
inner join
(
  select min(priority) priority, ProductID, max(ContactID) ContactID
  from yourtable
  group by ProductID
) x
  on t1.ProductID = x.ProductID
  and t1.contactid = x.contactid

see SQL Fiddle with Demo

This is getting the MIN() priority value – the highest – and then the MAX() contactId