Grouping by and getting multiple rows to one cell separated by commas - sql

Question

I know that title is ambigious and I know that there are similiar questions here. I looked and could not made anything work exactly as I need.
I need to Group By ReportNumber and those sharing one category add to one cell.
My DB:
ID | CategorySymbol | ReportNumber | NumberInCategory
1 A 31 101
2 B 31 107
3 C 31 121
4 A 32 191
5 A 33 165
6 B 32 156
7 C 32 127
8 A 31 166
9 B 31 177
Desired result:
ReporNumber | CategoryA | CategoryB | CategoryC
31 **101,166** **107,177** 121
32 191 156 127
33 165 NULL NULL
One of many different attempts:
select ReportNumber,
CategoryFirst, CategorySecond, CategoryThird, CategoryFourth
from
(
select NumberInCategory, Report.value('(/Report/#ReportNumber)[1]', 'nvarchar(max)') AS ReportNumber,
'Category' + cast(CategorySymbol as varchar(10)) CategorySymbol
from dbo.ReportDB t
) d
pivot
(
max(NumberInCategory)
for CategorySymbol in (CategoryFirst, CategorySecond, CategoryThird, CategoryFourth)
) piv;
My result:
ReporNumber | CategoryA | CategoryB | CategoryC
31 **166** **177** 121
32 191 156 127
33 165 NULL NULL
It is obvious why the result is how it is - max(NumberInCategory). The only question is how do I get to make a query that selects Number based on the CategorySymbol in for loop. I tried doing funtions that return one result like STUFF or simple SELECT but couldn't do them properly. It does not let me replace max(NumberInCategory).
E.g. something like that:
STUFF((SELECT ', ' + CAST(NumberInCategory AS VARCHAR(10)) [text()], Report.value('(/Report/#ReportNumber)[1]', 'nvarchar(max)') AS ReportNumber
FROM ReportDB
WHERE ReportNumber = t.ReportNumber
FOR XML PATH(''), TYPE)
.value('.','NVARCHAR(MAX)'),1,2,' ') List_Output

Answer 1

Using the stuff() with select ... for xml path ('') method of string concatenation before pivot():
;with t as (
select
NumberInCategory
, Report.value('(/Report/#ReportNumber)[1]', 'nvarchar(max)') AS ReportNumber
, CategorySymbol
from dbo.ReportDB
)
select ReportNumber, CategoryA, CategoryB, CategoryC
from (
select
t.ReportNumber
, CategorySymbol = 'Category'+convert(varchar(10),t.CategorySymbol)
, NumberInCategory = stuff((
select ', '+convert(varchar(13),i.NumberInCategory)
from t i
where i.ReportNumber = t.ReportNumber
and i.CategorySymbol = t.CategorySymbol
order by i.NumberInCategory
for xml path (''), type).value('(./text())[1]','nvarchar(max)')
,1,2,'')
from t
group by t.ReportNumber, t.CategorySymbol
) s
pivot (max(NumberInCategory)
for CategorySymbol in (CategoryA, CategoryB, CategoryC)
) piv;
rextester demo: http://rextester.com/OSAZ69656
returns:
+--------------+-----------+-----------+-----------+
| ReportNumber | CategoryA | CategoryB | CategoryC |
+--------------+-----------+-----------+-----------+
| 31 | 101, 166 | 107, 177 | 121 |
| 32 | 191 | 156 | 127 |
| 33 | 165 | NULL | NULL |
+--------------+-----------+-----------+-----------+

Answer 2

Here's a slightly different flavor...
IF OBJECT_ID('tempdb..#TestData', 'U') IS NOT NULL
DROP TABLE #TestData;
CREATE TABLE #TestData (
ID INT NOT NULL PRIMARY KEY CLUSTERED,
CategorySymbol CHAR(1) NOT NULL,
ReportNumber int NOT NULL,
NumberInCategory INT NOT NULL
);
INSERT #TestData(ID, CategorySymbol, ReportNumber, NumberInCategory) VALUES
(1, 'A', 31, 101),
(2, 'B', 31, 107),
(3, 'C', 31, 121),
(4, 'A', 32, 191),
(5, 'A', 33, 165),
(6, 'B', 32, 156),
(7, 'C', 32, 127),
(8, 'A', 31, 166),
(9, 'B', 31, 177);
-- SELECT * FROM #TestData td;
--==================================================================================
SELECT
td1.ReportNumber,
CategoryA = MAX(CASE WHEN td1.CategorySymbol = 'A' THEN STUFF(c.CSV, 1, 1, '') END),
CategoryB = MAX(CASE WHEN td1.CategorySymbol = 'B' THEN STUFF(c.CSV, 1, 1, '') END),
CategoryC = MAX(CASE WHEN td1.CategorySymbol = 'C' THEN STUFF(c.CSV, 1, 1, '') END)
FROM
#TestData td1
CROSS APPLY (
(SELECT
CONCAT(',', td2.NumberInCategory)
FROM
#TestData td2
WHERE
td1.CategorySymbol = td2.CategorySymbol
AND td1.ReportNumber = td2.ReportNumber
FOR XML PATH(''))
) c (CSV)
GROUP BY
td1.ReportNumber;
Results...
ReportNumber CategoryA CategoryB CategoryC
------------ ---------- ---------- ----------
31 101,166 107,177 121
32 191 156 127
33 165 NULL NULL