Question

我有两张桌子。文件夹和FolderPermission 有些文件夹由于某种原因没有权限，所以我试图根据模型文件夹ID = 1207

将权限分配给没有权限的文件夹

我有以下查询，但实际上并不起作用。我虽然很亲密。其中一个问题是新插入的folderID必须不存在于数据库表FolderPermission中，因为它不允许重复的条目。因此，必须根据不存在的记录输入FolderID。这是我的代码：

INSERT INTO FolderPermission (FolderID, PermissionID,AllowAccess,RoleID,UserID,CreatedByUserID,CreatedOnDate,LastModifiedByUserID,LastModifiedOnDate)
          SELECT FolderID, PermissionID,AllowAccess,RoleID,UserID,CreatedByUserID,CreatedOnDate,LastModifiedByUserID,LastModifiedOnDate
          FROM FolderPermission
          WHERE FolderID=1207
SELECT FolderID
FROM Folders 
WHERE FolderID NOT IN (SELECT DISTINCT FolderID  
                         FROM FolderPermission  )

Answer 1

您可以使用cross join从模型到ID列表将两个查询合并为一个：

INSERT INTO FolderPermission (FolderID, PermissionID, AllowAccess, RoleID, UserID, 
                              CreatedByUserID, CreatedOnDate, LastModifiedByUserID,
                              LastModifiedOnDate
                             )
    SELECT f.FolderID, PermissionID, AllowAccess, RoleID,UserID, CreatedByUserID, CreatedOnDate,
           LastModifiedByUserID, LastModifiedOnDate
    FROM FolderPermission fp cross join
         (SELECT FolderID
          FROM Folders 
          WHERE FolderID NOT IN (SELECT DISTINCT FolderID  
                                 FROM FolderPermission
                                )
         ) f
    WHERE fp.FolderID = 1207;

以增量方式基于另一个表的现有条目插入记录

1 个答案: