Question

I’ve got two tables – tonight I’m honestly believing I’m having a blonde moment.

Headings

HeadingID, HeadingName, TopicID

SubHeadings

SubHeadingID, SubHeadingName, HeadingID

What I’d like to do is to duplicate all entries in Headings and SubHeadings where TopicID = 1 to = 2.

I’ve written:

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

I’m stuck on the SubHeadings; I’d like to put in the new HeadingID that has just been created and I’ve got no idea. I can do the rest of the fields with the same Insert/Select statement however I’m stumped.

Can someone please help me out with an example or some documentation please?

Simplified the data looks like this:

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

Following query will help you 🙂

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