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Asked: 2026-05-30T23:56:43+00:00

I have some tables like this : I. parent table : id_client id_group package

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I have some tables like this :

I. parent table :

id_client      id_group   package       start_date   end_date     id_contract   is_parent   
1223           88         1234          2012-01-01   2050-01-01   156447        1           
1223           89         34342         2011-04-01   2050-01-01   156447        1

II. share table :

id        package      id_share
1         1234         SS4433  - parent
2         564679       SS4433  --- this is a child
3         564522       SS4433  -- this is a child 
4         34342        SS2345  - parent
5         665456       SS2345  -- child
6         7789997      SS2345  -- child

III. child table :

package       start_date   end_date      id_contract      

564679        2011-01-01   2012-02-01    156447
564522        2011-01-01   2011-05-07    156447
665456        2011-01-01   2012-02-04    156447
7789997       2011-01-01   2011-07-03    156447

The question is how to select with one query the parent and all it’s children in the same select (based on id_share in share table), that contains the group of the parent.

The result should look like this: 

id_client      id_group      package         start_date  end_date    id_contract   child_of
1223           88            1234            2012-01-01  2050-..     156447        0
1223           88            564679          2011-01-01  2012-02-01  156447        1234
1223           89            34342           2011-04-01  2050-...    156447        0
1223           89            665456          2011-01-01  2012-02-04   156447        34342

I have tried in every way .. but I can’t figure it out how to do it .. without union all

I have tried this :

select a.id_client, a.id_group, ??package?? , id_contract , ??child_of??
from parent_table a 
join share_table b on b.package = a.package
join share_table c on c.id_share = b.id_share
join child_table d on d.package = c.package

PS: I need to find parents and childs that corespond to 2012-01-01 – 2012-01-31 interval

where i have put ?? i don;t know .

Thanks

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1 Answer

  1. Editorial Team

    UPDATED, to restrict parents and children by date:

    select a.id_client,
       a.id_group,
       coalesce(d.package, a.package) package,
       coalesce(d.start_date, a.start_date) start_date,
       coalesce(d.end_date, a.end_date) end_date,
       coalesce(d.id_contract, a.id_contract)  id_contract,
       case when d.package is not null then a.package else 0 end child_of
from parent_table a 
join share_table b on b.package = a.package
join share_table c on c.id_share = b.id_share
left join child_table d on d.package = c.package and
                           d.start_date <= '2012-01-31' and
                           d.end_date >= '2012-01-01' 
where a.start_date <= '2012-01-31' and
      a.end_date >= '2012-01-01' and
      (d.package is not null or a.package = c.package)
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