Question

如何将以下两个查询合并为一个？

首先，我将所有检查员转移到不同的办公室，然后改变那些没有任何公开任务的检查员的办公室通道。

 UPDATE 
  Inspectors 
 SET 
  OfficeID = 40
 WHERE CountryID = 116 AND OfficeID = 5

UPDATE 
Inspectors 
SET 
OfficeAccess = ',40'
FROM Inspectors i 
WHERE NOT EXISTS (SELECT * from InspectionScope insp
        INNER JOIN Assignments a ON a.AssignmentID = insp.AssignmentID
        WHERE insp.InspectorID = i.InspectorID 
        AND a.CurrentStatus = 1)
AND i.CountryID = 116 AND i.OfficeID = 5

Answer 1

UPDATE Inspectors 
       SET OfficeID = 40,
       OfficeAccess = CASE WHEN a.CurrentStatus = 1 THEN OfficeAccess = ',40' ELSE OfficeAccess  END--this is a varchar field
FROM   Inspectors i 
       INNER JOIN InspectionScope insp 
           ON insp.InspectorID = i.InspectorID 
       LEFT JOIN Assignments a 
           ON a.AssignmentID = insp.AssignmentID 
WHERE  i.CountryID = 116 AND i.OfficeID = 5

Answer 2

我不确定将它们组合起来是个好主意，但它应该是可能的。此方法使用left outer join来保留Inspectors表中的所有行。这允许设置OfficeId。然后它使用case语句来检查连接其余部分的匹配行（可能用于过滤）：

UPDATE Inspectors 
   SET OfficeID = 40,
       OfficeAccess = (Case when a.AssignmentId is not null then ',40' else OfficeAccess end)
FROM Inspectors i LEFT JOIN
     InspectionScope insp
     ON insp.InspectorID = i.InspectorID LEFT JOIN
     Assignments a
    ON a.AssignmentID = insp.AssignmentID AND a.CurrentStatus = 1
WHERE i.CountryID = 116 AND i.OfficeID = 5

Answer 3

要结合两者，我会使用左连接并查找两种组合。

像...一样的东西。

    UPDATE Inspectors
SET OfficeID = 40
    , OfficeAccess = CASE 
        WHEN a.CurrentStatus <> 1
            OR (
                insp.InspectorID IS NULL
                OR a.assignmentid IS NULL
                )
            THEN OfficeAccess = ',40'
        ELSE NULL
        END
FROM Inspectors i
LEFT JOIN InspectionScope insp
    ON insp.InspectorID = i.InspectorID
LEFT JOIN Assignments a
    ON a.AssignmentID = insp.AssignmentID
WHERE i.CountryID = 116
    AND i.OfficeID = 5

如何根据多个条件更新多个列

3 个答案: