Question

我有一个像这样的SQL查询：

UPDATE ScheduleTasks  
SET 
AssignedResource='360 CLEAN'
WHERE (ScheduleID = (SELECT ScheduleID FROM Schedule WHERE Job_No = 'ABC123')) 
AND Description = 'Filing'

我的问题是，我有一个名为Resource的表Resource_ID和Resource_Name我想要做的是用{{1}更新scheduleTasks表而Resource_ID不是Resource_Name，360 CLEAN而不是Resource_Name我的问题是如何从{{1}获得Resource_ID }}

Answer 1

您可以在INNER JOIN语句中使用UPDATE执行此操作，如下所示：

UPDATE st SET
    AssignedResource = r.Resource_ID
FROM ScheduleTasks st
    -- change join conditions to your preference
    INNER JOIN Resource r on r.Resource_Name = '360 CLEAN'     
WHERE st.Description = 'Filing' AND EXISTS
(
    SELECT s.ScheduleID 
    FROM Schedule s
    WHERE s.Job_No = 'ABC123' AND st.ScheduleID = s.ScheduleID
)

同时更新了您的查询，以便检查ScheduleID表中是否存在来自ScheduleTasks的{{1}}。

Answer 2

尝试使用sortx

sub-query

Answer 3

如果要更新ScheduleTasks（我推荐）中的所有记录，请使用：

UPDATE ST
SET AssignedResource = R.Resource_ID
FROM ScheduleTasks ST
  INNER JOIN Resource R ON R.Resource_Name = ST.AssignedResource

如果要限制更新内容，请添加WHERE子句，如下所示：

UPDATE ST
SET AssignedResource = R.Resource_ID
FROM ScheduleTasks ST
  INNER JOIN Resource R ON R.Resource_Name = ST.AssignedResource 
  INNER JOIN Schedule S ON S.ScheduleID = ST.ScheduleID 
WHERE ST.AssignedResource = '360 CLEAN'
   AND ST.Description = 'Filing'
   AND S.Job_No = 'ABC123'

SQL Update SET子查询？

3 个答案: