Concat rows values into single column

Hi All,
How can I concat values of a multiple rows into a single column by separating them by comma.
Eg:
SELECT empno FROM emp;
empno
1
2
3
4
I want output should be:
Empnos
1,2,3,4
Thanks & Regards,
Danish

MichaelS wrote:
Or
SQL> select rtrim(xmlagg(xmlelement(e, empno || ',')).extract('//text()').extract('//text()') ,',') empnos from emp
EMPNOS
7369,7499,7521,7566,7654,7698,7782,7788,7839,7844,7876,7900,7902,7934
Hi Michael,
is it an error or is it correct to put extract 2 times? This is giving to me the same result:
select rtrim(xmlagg(xmlelement(e, empno || ',')).extract('//text()'),',') empnos from emp;
EMPNOS
7369,7499,7521,7566,7654,7698,7782,7788,7839,7844,7876,7900,7902,7934           Regards.
Al

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There is a SourceTable1 (Employee) with Columns like EmployeeID,Name,DOB.
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insert into #Employee VALUES (1001,'Sara','1996-12-10')
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CREATE table #EmployeeCode
(EmployeeID int, Code varchar(10), [Order] int)
insert into #EmployeeCode VALUES (1000,'AA',1)
insert into #EmployeeCode VALUES (1000,'BB',2)
insert into #EmployeeCode VALUES (1000,'CC',3)
insert into #EmployeeCode VALUES (1001,'AAA',1)
insert into #EmployeeCode VALUES (1001,'BBB',2)
insert into #EmployeeCode VALUES (1001,'CCC',3)
insert into #EmployeeCode VALUES (1001,'DDD',4)
insert into #EmployeeCode VALUES (1002,'AAAA',1)
insert into #EmployeeCode VALUES (1002,'BBBB',2)
insert into #EmployeeCode VALUES (1002,'CCCC',3)
insert into #EmployeeCode VALUES (1002,'DDDD',4)
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---Source tbl 3
CREATE table #EmployeeRegioncode
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insert into #EmployeeRegioncode VALUES (1000,'xx',1)
insert into #EmployeeRegioncode VALUES (1000,'yy',2)
insert into #EmployeeRegioncode VALUES (1000,'zz',3)
insert into #EmployeeRegioncode VALUES (1001,'xx',1)
insert into #EmployeeRegioncode VALUES (1001,'yy',2)
insert into #EmployeeRegioncode VALUES (1001,'zz',3)
insert into #EmployeeRegioncode VALUES (1001,'xy',4)
insert into #EmployeeRegioncode VALUES (1002,'qq',1)
insert into #EmployeeRegioncode VALUES (1002,'rr',2)
insert into #EmployeeRegioncode VALUES (1002,'ss',3)
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insert into #EmployeeDetails VALUES (1000,'AA','BB','CC','','','xx','yy','zz','')
insert into #EmployeeDetails VALUES (1001,'AAA','BBB','CCC','DDD','','xx','yy','zz','xy')
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SELECT * FROM #Employee
SELECT * FROM #EmployeeCode
SELECT * FROM #EmployeeRegioncode
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Can you please help me to get the desired /targetoutput? I have sql server 2008.
Your help is greatly appreciated.

select a.EmployeeID,b.code1,b.code2,b.code3,b.code4,b.code5,c.Reg1,c.Reg2,c.Reg3,c.Reg4 from
#Employee a
left outer join
(select EmployeeID,max(case when [Order] =1 then Code else '' end) code1,
max(case when [Order] =2 then Code else '' end)code2,
max(case when [Order] =3 then Code else '' end)code3,
max(case when [Order] =4 then Code else '' end)code4,
max(case when [Order] =5 then Code else '' end)code5 from #EmployeeCode group by EmployeeID) b
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