Performing multiple inserts for a single row in a query - sql

Question

I have a table containing data that i need to migrate into another table with a linking table. This is a one time migration as part of an upgrade.
I have a company table that contains records relating to a company and a contact person.
I want to migrate the contact details into another table and link the new person with a linking table
Consider I have this table which is already populated
tblCompany
CompanyId
CompanyName
RegNo
ContactForename
ContactSurname
And i want to migrate the contact person data to
tblPerson
PersonID (identitycolumn)
Forename
Surname
and use the identity column resulting and insert it into the linking table
tblCompanyPerson
CompanyId
PersonId
I've tried a few different ways to approach this using cursors and output variables into a temp table but none seem right to me (or give me the solution...)
The closest i have got is to have a companyID on tblPerson and insert companyId into it and output the new personId and the companyId into a temp table. Then loop through the temp table to create the tblCompanyContact.
example
declare #companycontact TABLE (companyId int, PersonId int)
insert into tblPerson
(Forename,
Surname,
CompanyID)
output inserted.CompanyID, INSERTED.PersonID into #companycontact
select
ContactPersonForeName,
ContactPersonSurename,
CompanyID
from tblCompany c
insert into tblCompanyPerson
(CompanyID,
PersonID)
select c.companyId, PersonId from #companycontact c
Background
Im using MS SQL Server 2008 R2
The tblPerson is already populated with hundreds of thousands of
records.

Answer 1

There is a 'trick' using MERGE statement to achieve mapping between newly inserted and source values:
MERGE tblPerson trgt
USING tblCompany src ON 1=0
WHEN NOT MATCHED
THEN INSERT
(Forename, Surename)
VALUES (src.ContactPersonForeName, src.ContactPersonSurename)
OUTPUT src.CompanyID, INSERTED.PersonID
INTO tblCompanyPerson (CompanyId, PersonID);
That 1=0 condition is to always get everything from source. You might want to replace it or even whole source with some sub-query to actually check whatever you already have same person mapped.
EDIT: Here is some reading about using MERGE and OUTPUT

Answer 2

Because I don't know what SQL you are using its difficult to decide if this is correct. i also don't know if you already tried this but it's the best idea i have:
insert into tblPerson
(Forename, Surename)
Select ContactForename, ContactPersonSurename
from tblCompany
insert into tblCompanyPerson
(CompanyID, PersonID)
select CompanyId, PersonID
from tblPerson, tblCompany
where ContactForename = Forename and ContactPersonSurename = Surename
Sarajog