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Left Join Preserving NULL Records


You would use union all. Of course, there is an issue with the ids. Something like this might work:

select row_number() over (order by
(select NULL)) as id, name, bid, bname
from ((select a.id, a.name, b.id as bid, b.name as
bname
       from tableA a inner join
            tableB b
            on a.name = b.name
      ) union all
      (select a.id, a.name, NULL, NULL
       from tableA a
      )
     ) ab;

This doesn't preserve the first id column. But then again, it is hard to say what that is for.

EDIT:

Actually, this might preserve it the way you want it:

select id, name, bid, bname
from ((select a.id, a.name, b.id as bid, b.name as
bname
       from tableA a inner join
            tableB b
            on a.name = b.name
      ) union all
      (select a.id + (max(id) over ()), a.name,
NULL, NULL
       from tableA a
      )
     ) ab;

Categories : SQL

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