如何将一组指定列的所有行从一个表插入另一个表

Question

SQL n00b trying to figure out how to do the following without writing a loop.

I have 2 tables like

      First                        Second
=================       ============================ 
 Id |   Name             Id | FirstId | DisplayName
=================       ============================
 1  |  'foo'            
-----------------
 2  |  'bar'
----------------
 3  |  'baz'

and I want a query that places a row in Second for every row in First , like

      First                        Second
=================       ============================ 
 Id |   Name             Id | FirstId | DisplayName
=================       ============================
 1  |  'foo'             1  |   3     | 'bazness' 
-----------------       ----------------------------
 2  |  'bar'             2  |   1     | 'fooness'
----------------        ----------------------------
 3  |  'baz'             3  |   2     | 'barness'

So the formula was: for each row f in First , add a row in Second with f.Id as FirstID and f.Name + 'ness' as DisplayName .

Answer 1

You just want insert . . . select insert . . . select insert . . . select :

insert into second (firstId, DisplayName)
    select id, name + 'ness'
    from first;

Note: This assumes that second.id is declared as an identity column. If not:

insert into second (id, firstId, DisplayName)
    select row_number() over (order by (select null)), id, name + 'ness'
    from first;