更新表时在内部连接中排序

Question

我需要通过内部连接另一个表来更新一个表。下面是例子。

Employee table:

role        name    Time create
manager     abc      2013
sales       def      2014
manager     xyz      2015
sales       dje      2015

Currentteam:

role      name
manager 
sales

我需要使用员工表中的名称更新 Currentteam 表，但我需要更新 manager 角色的最近名称含义。我们在Employee 表中有两个名称，但我只需要更新一个最近的名称，即XYZ。我试图做类似下面的事情，但它不允许在子查询中使用order by。

Update currentteam
Set name=temp.name
From currentteam
Inner join (select * from employee order by timecreate) as temp on temp.role=currentteam

请指教！！！

Answer 1

您可以使用相关子查询：

SQL Fiddle

UPDATE  ct
    SET ct.name = (
        SELECT TOP 1 name
        FROM Employee e
        WHERE e.role = ct.role
        ORDER BY TimeCreate DESC
    )
FROM CurrentTeam ct

结果：

|    role | name |
|---------|------|
| manager |  xyz |
|   sales |  dje |

Answer 2

看起来您正在使用 SQL Server。如果是这样，row_number() 来救援：

Update currentteam
    Set name = temp.name
From currentteam Inner join
     (select e.*,
             row_number() over (partition by role order by timecreate desc) as seqnum
      from employee e
     ) temp
     on temp.role = currentteam and seqnum = 1;