需要更新FK與新的PK重複

Question

我有兩張桌子 - 今晚我真的相信我有一個金髮的時刻。

標題

HeadingID, HeadingName, TopicID 

副標題

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我希望做的是重複的標題和其中TopicID = 1 = 2

我所有條目SubHeadings已寫：

INSERT INTO Headings (HeadingName, TopicID) 
SELECT HeadingName, 2 FROM Headings WHERE TopicID = 1 //(Duplicating Headings and assigning TopicID 2). 

我卡在SubHeadings;我想提交剛剛創建的新HeadingID，我不知道。我可以用相同的插入/選擇語句來完成剩餘的字段，但是我很難過。

有人可以請幫助我一個例子或一些文件嗎？

簡化了數據看起來是這樣的：

HeadingID = 1 
HeadingName = 'News' 
TopicID = 1 
HeadingID = 2 
HeadingName = 'Sport' 
TopicID = 1 

SubHeadingID = 1 
SubHeadingName = 'Local' 
HeadingID = 1 
SubHeadingID = 2 
SubHeadingName = 'National' 
HeadingID = 1 
SubHeadingID = 3 
SubHeadingName = 'International' 
HeadingID = 1 
SubHeadingID = 4 
SubHeadingName = 'Baseball' 
HeadingID = 2 
SubHeadingID = 5 
SubHeadingName = 'Cricket' 
HeadingID = 2 

Answer 1

下面的查詢將幫助你:)

INSERT INTO SubHeadings (SubHeadingName, HeadingID) 
SELECT subhdng.SubHeadingName, hdng.HeadingID 
FROM Headings hdng 
INNER JOIN SubHeadings subhdng ON hdng.HeadingID = subhdng.HeadingID 
WHERE hdng.TopicID = 2