Question

I am using VS2005 C# and SQL Server 2005. I want to form an SQL query with the following condition:

Check for duplicated user in Table1 tb1 where tb1 has more than one [Emp.Name]

EDIT:

Simply saying, if I am only checking duplicate for [emp name], there’s no way I can select [employeeID]?

Because if I use

INSERT INTO DuplicateUserInTb1(EmployeeID, [Emp Name], Status, Issue)
SELECT tb1.EmployeeID, tb1.[Emp Name], 'Active', 'Duplicated user in Table1'
FROM Table1 tb1 GROUP BY tb1.[employeeID], tb1.[emp name] HAVING COUNT(tb1.[emp name]) >1 

I will not be able to see any duplicated [emp name] rows inserted.

However, if I use

INSERT INTO DuplicateUserInTb1([Emp Name], Status, Issue)
SELECT tb1.EmployeeID, tb1.[Emp Name], 'Active', 'Duplicated user in Table1'
FROM Table1 tb1 GROUP BY tb1.[emp name] HAVING COUNT(tb1.[emp name]) >1

I am able to retrieve duplicated [emp name], however, without [employeeID].

---

EDITED:

Working on these 2 queries provided by Zohalib and Michal Powaga respectively:

 INSERT INTO DuplicateUserInTb1(EmployeeID, [Emp Name], Status, Issue) 
 select t.emp_id, t.empname, t.active, t.du 
from (select s1.emp_id, s1.empname,'Active' as active, 'Duplicate User' as du,
ROW_NUMBER() OVER (PARTITION BY s1.empName ORDER BY s1.empName) as rowNum 
from table s1, 
(select emp_name, count(*)
 from table 
 group by emp_name
 having count(*) > 1) s2
 where s1.emp_name = s2.emp_name 
) t where t.rowNum = 1

Error : No column was specified for column 2 of ‘s2

---

insert into DuplicateUserInTb1(EmployeeID, [Emp Name], Status, Issue)
select employeeID, [emp name], 'Active', 'Duplicated user in Table1'
from Table1 t1
join (
    select [emp name]
    from Table1
    group by [emp name]
    having count(*) > 1
) t on t1.[emp name] = t.[emp name]

Error: *Ambiguous column name '[Emp name]'

---

Would appreciate any help, thank you.

Answer 1

When you use Group By clause, then your select clause can only contain columns

which are either mentioned in group by clause

Or aggregate functions, eg Count, SUM e.t.c
http://www.w3schools.com/sql/sql_groupby.asp

Moreover, in your query, you are inserting values in three columns, but your select clause is selecting four values, should’nt this be a problem ?

try following query to insert duplicates based on empname

    INSERT INTO DuplicateUserInTb1(EmployeeID, [Emp Name], Status, Issue) 
select t.emp_id, t.empname, t.active, t.du 
from (select s1.emp_id, s1.empname,'Active' as active, 'Duplicate User' as du, ROW_NUMBER() OVER (PARTITION BY s1.empName ORDER BY s1.empName) as rowNum 
from table s1, 
(select emp_name, count(*) as counts
 from table 
 group by emp_name
 having count(*) > 1) s2
 where s1.emp_name = s2.emp_name 
) t where t.rowNum = 1