Question

Possible Duplicate:
Combining rows of queried results by unique identifier?

I have two tables in Sql Server 2008, like below

Table1

       DealNum            DealVresion            Value

        1000                   1                 100
        1000                   2                 200
        1000                   3                 150  
        1000                   4                 130
        1001                   2                  70
        1003                   5                 160
        1003                   0                 120                    

Table 2

     DealNum            DealVersion              Name 

     1000                    1                   John
     1000                    1                   Bob
     1000                    2                   John
     1000                    2                   Merle
     1000                    3                   Bob
     1000                    3                   Bob
     1000                    5                   Bob
     1001                    2                   Smith
     1001                    2                   stone
     1002                    8                   Andrew
     1003                    5                   Smith
     1003                    0                   Martin
     1003                    0                   Narine

Now I want a left join on these two tables based on

     (T1.Dealnum= T2.Dealnum) and (T1.Deal Version = T2.Deal Version)

and I want the Name from Table2 to be concatenated so that it won’t show any duplicates in DealNum.

Result Required:

         DeaLNum           Deal Version          Value          Name

          1000                  1                 100           Jhon,Bob
          1000                  2                 200           John,Merle
          1000                  3                 150           Bob
          1000                  4                 130           NULL
          1001                  2                 70            Smith,Stone                  
          1003                  0                 120           Martin,Narine
          1003                  5                 160           Smith

It has to concatenate the names column for the DealNum and version.
If the same dealNum and Version has the same name then no need to Concatenate(ex: 1000 – 3)

Thanks In advance
Harry

Answer 1

You can do this by creating a user defined function, don’t know if it can be done in a single select statement:

    create function getNameList(@dealnum int, @dealversion int) returns nvarchar(max)
    begin
    declare @name varchar(max)

    select  @name = coalesce(@name + ', ','') + name
    from    (select distinct name from table2 where dealnum = @dealnum and dealversion = @dealversion) t1

    return @name
    end

then:

    select  distinct
            t1.dealNum,
            t1.dealVersion,
            t1.value,
            dbo.getNameList(t1.dealNum, t1.dealversion)
    from    table1 t1 join table2 t2 on t1.dealnum = t2.dealnum and t1.dealversion = t2.dealversion