Question

我有两张桌子：

Table 1 - [EmployeeERP]:

[EMER_ID] - My Own Identity - primary key
[EMER_CreateDate]
[EMER_EmployeeID]
[EMER_EmployeeNumber]



Table 2 - [ERP_TEST]:

[ERPT_ID] -  My Own Identity - primary key
[ERPT_EmployeeNumber]
[ERPT_EmployeeID]
[ERPT_IsDuplicate]

我写了这个命令来将数据从一个表转移到另一个表：

INSERT INTO [dbo].[ERP_TEST] ([ERPT_ID],[ERPT_EmployeeNumber],[ERPT_EmployeeID])
select [EMER_ID],[EMER_EmployeeNumber],[EMER_EmployeeID] from [dbo].[EmployeeERP]

后来我写了这个查询：

SELECT * 
FROM (
select [EMER_EmployeeID] , count(*) as cnt
from  [dbo].[EmployeeERP]
group by [EMER_EmployeeID]
) as T
where T.cnt > 1

现在，如果[ERP_TEST]表中的**ERPT_IsDuplicate**重复，我想在字段EMER_EmployeeID的表EmployeeERP中有1（int）否则为0（int）。

你能帮帮我吗？

Answer 1

如果您希望该标志引用EmployeeERP表中重复的员工ID，那么您可以使用join：

update t
    set erpt_isduplicate = (case when e.cnt > 1 then 1 else 0 end)
    from erp_test t left join
         (select [EMER_EmployeeID], count(*) as cnt
          from  [dbo].[EmployeeERP]
          group by [EMER_EmployeeID]
         ) e
         on e.emer_employeeid = t.ERPT_EmployeeID;

我假设您正在使用SQL Server，基于您的语法。

根据查询结果更新字段

1 个答案: