我有两张桌子 - 今晚我真的相信我有一个金发碧眼的时刻。
HeadingID, HeadingName, TopicID
SubHeadingID, SubHeadingName, HeadingID
我想要做的是复制标题中的所有条目和SubHeadings
TopicID
= 1 = = 2。
我写过:
INSERT INTO Headings (HeadingName, TopicID)
SELECT HeadingName, 2 FROM Headings WHERE TopicID = 1 //(Duplicating Headings and assigning TopicID 2).
我被困在SubHeadings
;我想加入刚刚创建的新HeadingID
并且我不知道。我可以使用相同的Insert / Select语句来完成其余的字段,但是我很难过。
有人可以帮我一个例子或一些文件吗?
简化数据如下所示:
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
答案 0 :(得分:0)
以下查询将帮助您:)
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