Sql-server – Selecting multiple values from a column and put them into separate columns

This is relatively trivial to do with a correlated subquery. You can't use the COALESCE method highlighted in the blog post you mention unless you extract that to a user-defined function (or unless you only want to return one row at a time). Here is how I typically do this:

DECLARE @x TABLE 
(
  id INT, 
  row_num INT, 
  customer_code VARCHAR(32), 
  comments VARCHAR(32)
);

INSERT @x SELECT 1,1,'Dilbert','Hard'
UNION ALL SELECT 1,2,'Dilbert','Worker'
UNION ALL SELECT 2,1,'Wally','Lazy';

SELECT id, customer_code, comments = STUFF((SELECT ' ' + comments 
    FROM @x AS x2 WHERE id = x.id
     ORDER BY row_num
     FOR XML PATH('')), 1, 1, '')
FROM @x AS x
GROUP BY id, customer_code
ORDER BY id;

If you have a case where the data in comments could contain unsafe-for-XML characters (>, <, &), you should change this:

     FOR XML PATH('')), 1, 1, '')

To this more elaborate approach:

     FOR XML PATH(''), TYPE).value(N'(./text())[1]', N'varchar(max)'), 1, 1, '')

(Be sure to use the right destination data type, varchar or nvarchar, and the right length, and prefix all string literals with N if using nvarchar.)

This sounds more like an UNPIVOT to me.

SELECT SalesTable.Pk, CrossApplied.WeekYear, CrossApplied.Value
FROM SalesTable
CROSS APPLY (VALUES ('01'+CAST([Year] AS CHAR(40)), Week1),
                    ('02'+CAST([Year] AS CHAR(40)), Week2),
                    ('03'+CAST([Year] AS CHAR(40)), Week3),
                    .......)
        CrossApplied (WeekYear, Value)

There are other ways to do an UNPIVOT but using CROSS APPLY is my favorite. I give a more general example here.