Converting sql table to another sql table

Question

How do I loop through a SQL table's rows and convert them into rows for another table? I have a table with an Id, Timestamp, IpAddress, and two varchar(500)'s that I want to change to another table with an Id, StartTime and EndTime initialized to the Timestamp, no IpAddress, and foreign keys to tables holding initially each their varchar(500). Thanks!

Answer 1

If the table already exists, the syntax is:

insert into TargetTable
(field1, field2, etc)
select field1, field2, etc
from OtherTables
where whatever

Answer 2

You can use select ... into to create a new table from a select statement:

select  orig.Id
,       orig.Timestamp
,       fk1.Id
,       fk2.id
into    NewTable
from    OldTable orig
join    ForeignKey1 fk1
on      fk1.value = orig.varchar_1
join    ForeignKey2 fk2
on      fk2.value = orig.varchar_2

alter table NewTable add constraint FK_NewTable_ForeignKey1 
    foreign key references ForeignKey1(Id)

alter table NewTable add constraint FK_NewTable_ForeignKey2
    foreign key references ForeignKey2(Id)