SELECT INTO SELECT CAN IT ACCEPT MORE THAN ONE LINE ?

Hi i have a table that i have to fill with information from an old one, but there are two colomns that i have to fill with another table. So here is the select that i will use with the insert part.
select
id_migration_mig,
(select a.id_instance_ins
from gdiexp.t_instance a, gdiprod.t_migration_detail b, gdiexp.t_bd c
where a.id_instance_ins = c.id_instance_ins and c.id_base_donnee_bd = b.id_instance_ins_actuelle),
(select a.id_instance_ins
from gdiexp.t_instance a, gdiprod.t_migration_detail b, gdiexp.t_bd c
where a.id_instance_ins = c.id_instance_ins and c.id_base_donnee_bd = b.id_instance_ins_cible),
type_environnement,
date_migration,
donnees_sources,
date_au_plus_tot,
methode,
date_dern_maj_ctrl,
code_usager_ctrl
from gdiprod.t_migration_detail;
problem is that this gives me a ORA-01427: single-row subquery returns more than one row. How can i solve that ? Thanks.

Your queries in the select clause need to be correlated witt the rows you are selecting from gdiprod.t_migration_detail. You should not need to have gdiprod.t_migration_detail in those queries. I believe that you need something more like:
select id_migration_mig,
       (select a.id_instance_ins
        from gdiexp.t_instance a, gdiexp.t_bd c
        where a.id_instance_ins = c.id_instance_ins and
              c.id_base_donnee_bd = md.id_instance_ins_actuelle),
       (select a.id_instance_ins
        from gdiexp.t_instance a, gdiexp.t_bd c
        where a.id_instance_ins = c.id_instance_ins and
              c.id_base_donnee_bd = md.id_instance_ins_cible),
       type_environnement, date_migration, donnees_sources, date_au_plus_tot,
       methode, date_dern_maj_ctrl, code_usager_ctrl
from gdiprod.t_migration_detail md;You query, and my re-written version are essentially outer joins, and could be re-written as such. If you are sure that there will always be a match, that is, when oyu insert into your table, the columns populated by the scalar queries are never null, then it could (and probably should) be re-written as a equi-join.
John

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I've had my 30G Ipod since April 2006. For Christmas 2006, I bought my sister a 2G Ipod. I cannot figure out how to put songs on her Ipod as we both share the same computer and Itunes Library. I've already asked Ipod Corporate for help via their FAQ section regarding more than one Ipod operating with the same computer, but their advice (which told me to create a playlist small enough for her Ipod and checked as a shared playlist) did not work for me. I'd really appreciate any help with my problem. Owning an Ipod but being unable to listen to it, as I'm sure many people would agree, is quite annoying.

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