SQL 检查表中重复的用户名

Question

我正在使用 VS2005 C# 和 SQL Server 2005。我想形成一个具有以下条件的 SQL 查询：

检查 Table1 tb1 中的重复用户，其中 tb1 有多个 [Emp.Name]

编辑：

简单地说，如果我只检查重复的[emp name]，我就无法选择[employeeID]？

因为如果我使用

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 

我将无法看到插入的任何重复的[emp name] 行。

但是，如果我使用

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

我可以检索重复的[emp name]，但是没有[employeeID]。

---

已编辑：

分别处理 Zohalib 和 Michal Powaga 提供的这两个查询：

 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

错误：没有为 's2 的第 2 列指定任何列

---

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]

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

---

不胜感激，谢谢。

Answer 1

当您使用 Group By 子句时，您的 select 子句只能包含列

在 group by 子句中提及

或聚合函数，例如 Count、SUM 等 http://www.w3schools.com/sql/sql_groupby.asp

此外，在您的查询中，您在三列中插入值，但您的 select 子句选择了四个值，这不是问题吗？

尝试以下查询以根据 empname 插入重复项

    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

Answer 2

insert into DuplicateUserInTb1(EmployeeID, [Emp Name], Status, Issue)
select t1.employeeID, t1.[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]