Sql Server等效加入更新Oracle [重复]

Question

我的更新查询Sql Server如下：

Update Project set Name=Project.Name+' assignedTo '
FROM Project 
INNER JOIN EmployeeProject ON Project.ID = EmployeeProject.ProjectID 
INNER JOIN Employee ON EmployeeProject.EmployeeID = Employee.ID
WHERE (Employee.Name = N'Minion')

什么是等效的Oracle查询。我的尝试如下：

Update (SELECT Project.Name as ProjectName,Employee.Name as EmpName
        FROM Project 
        INNER JOIN EmployeeProject ON Project.ID = EmployeeProject.ProjectID 
        INNER JOIN Employee ON EmployeeProject.EmployeeID = Employee.ID  
        where Employee.Name=N'Minion' 
       ) T 
set T.ProjectName=' somting'

但给我错误无法修改映射到非键保留表的列。Sql 服务器工作正常。

Answer 1

你只需要exists:

update Project p
    set Name = p.Name+' assignedTo '
where exists (select 1
              from EmployeeProject join 
                   Employee e
                   on ep.EmployeeID = e.ID
              where e.Name = N'Minion' and p.ID = ep.ProjectID 
             );