将数据从同一表中的一行复制到另一行 SQL答案

【问题标题】：Copying data from one row to another in the same table SQL将数据从同一表中的一行复制到另一行 SQL
【发布时间】：2017-11-23 10:23:21
【问题描述】：

我很难在同一个表中将数据从一行复制到另一行。基本上，我有一个情况，其中[I/O#] 列等于'Client1' 但我想让[I/O#] 列等于'Client2' 而不删除归因于Client1 的数据，即我想保留与Client1 但只需将名称替换为 Client2。

我在我的 php 文件中尝试了以下 sql 查询，但没有成功：

$sql_UPDATE_query ="UPDATE [$connectionInfo[Database]].[dbo].[form_record]
                    SET
                        [Last_Edit] = newdata.[Last_Edit],
                        [User_Name] = newdata.[User_Name],
                        [Computer_Name] = newdata.[Computer_Name],
                        [form_name] = newdata.[form_name],
                        [Date] = newdata.[Date],
                        [facility] = newdata.[facility],
                        [Count] = newdata.[Count],
                        [Start_Time] = newdata.[Start_Time],
                        [Stop_Time] = newdata.[Stop_Time],
                        [MW/Hrs_Start] = newdata.[MW/Hrs_Start],
                        [MW/Hrs_Stop] = newdata.[MW/Hrs_Stop],
                        [M³] = newdata.[M³],
                        [MCF] = newdata.[MCF],
                        [Litres] = newdata.[Litres],
                        [Description] = newdata.[Description],
                        [Lock] = newdata.[Lock]
                    FROM
                        (
                        SELECT
                            [Last_Edit],
                            [User_Name],
                            [Computer_Name],
                            [form_name],
                            [Date],
                            [facility],
                            [Count],
                            [Start_Time],
                            [Stop_Time],
                            [MW/Hrs_Start],
                            [MW/Hrs_Stop],
                            [M³],
                            [MCF],
                            [Litres],
                            [Description],
                            [Lock]
                        FROM [$connectionInfo[Database]].[dbo].[form_record]
                        WHERE
                            [I/O#] = '$PrevIO'
                        ) newdata
                    WHERE
                        [I/O#] = '$IO'";

顺便说一句，$PrevIO 和 $IO 已经在我的 php 文件中定义（只是没有显示），所以这不是错误所在。

现在，假设$PrevIO='Client1' 和$IO='Client2。我怎样才能将表[form_record] 中属于Client1 的所有数据（行）归因于并将其复制到Client2，然后最终删除Client1 甚至更好，只需简单地替换名称，但你们知道得更好。我认为newdata 可以用作同一个表form_record 的别名表，但它似乎不起作用。

我使用的是 Microsoft SQL 2005 Server。

【问题讨论】：

标签： php sql sql-server sql-server-2005

【解决方案1】：

应该这样做，您只需要在表中包含正确的连接。

$sql_UPDATE_query ="UPDATE UPD
                    SET
                        [Last_Edit] = newdata.[Last_Edit],
                        [User_Name] = newdata.[User_Name],
                        [Computer_Name] = newdata.[Computer_Name],
                        [form_name] = newdata.[form_name],
                        [Date] = newdata.[Date],
                        [facility] = newdata.[facility],
                        [Count] = newdata.[Count],
                        [Start_Time] = newdata.[Start_Time],
                        [Stop_Time] = newdata.[Stop_Time],
                        [MW/Hrs_Start] = newdata.[MW/Hrs_Start],
                        [MW/Hrs_Stop] = newdata.[MW/Hrs_Stop],
                        [M³] = newdata.[M³],
                        [MCF] = newdata.[MCF],
                        [Litres] = newdata.[Litres],
                        [Description] = newdata.[Description],
                        [Lock] = newdata.[Lock]
                    FROM [$connectionInfo[Database]].[dbo].[form_record] UPD
                    INNER JOIN 
                        (
                        SELECT
                            [Last_Edit],
                            [User_Name],
                            [Computer_Name],
                            [form_name],
                            [Date],
                            [facility],
                            [Count],
                            [Start_Time],
                            [Stop_Time],
                            [MW/Hrs_Start],
                            [MW/Hrs_Stop],
                            [M³],
                            [MCF],
                            [Litres],
                            [Description],
                            [Lock]
                        FROM [$connectionInfo[Database]].[dbo].[form_record]
                        WHERE
                            [I/O#] = '$PrevIO'
                        ) newdata ON ***newdata.field = UPD.field***
                    WHERE
                        [I/O#] = '$IO'";

【讨论】：

是的，您需要将***newdata.field = UPD.field*** 替换为您的情况。

【解决方案2】：

你的join condition 不见了：

$sql_UPDATE_query ="UPDATE A
                    SET
                        [Last_Edit] = newdata.[Last_Edit],
                        [User_Name] = newdata.[User_Name],
                        [Computer_Name] = newdata.[Computer_Name],
                        [form_name] = newdata.[form_name],
                        [Date] = newdata.[Date],
                        [facility] = newdata.[facility],
                        [Count] = newdata.[Count],
                        [Start_Time] = newdata.[Start_Time],
                        [Stop_Time] = newdata.[Stop_Time],
                        [MW/Hrs_Start] = newdata.[MW/Hrs_Start],
                        [MW/Hrs_Stop] = newdata.[MW/Hrs_Stop],
                        [M³] = newdata.[M³],
                        [MCF] = newdata.[MCF],
                        [Litres] = newdata.[Litres],
                        [Description] = newdata.[Description],
                        [Lock] = newdata.[Lock]
                    FROM [$connectionInfo[Database]].[dbo].[form_record] A
                    INNER JOIN 
                        (
                        SELECT
                            [Last_Edit],
                            [User_Name],
                            [Computer_Name],
                            [form_name],
                            [Date],
                            [facility],
                            [Count],
                            [Start_Time],
                            [Stop_Time],
                            [MW/Hrs_Start],
                            [MW/Hrs_Stop],
                            [M³],
                            [MCF],
                            [Litres],
                            [Description],
                            [Lock]
                        FROM [$connectionInfo[Database]].[dbo].[form_record]
                        WHERE
                            [I/O#] = '$PrevIO'
                        ) newdata ON newdata.field = A.field
                    WHERE
                        [I/O#] = '$IO'";

【讨论】：