Re: Reporting by family tree - Mailing list pgsql-novice

From David G. Johnston
Subject Re: Reporting by family tree
Date
Msg-id CAKFQuwZVgp_Lvc01RXN0sB3sGR=Zud0dKVST2x6jiMisTLnr2g@mail.gmail.com
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In response to Re: Reporting by family tree  (o1bigtenor <o1bigtenor@gmail.com>)
Responses Re: Reporting by family tree  (o1bigtenor <o1bigtenor@gmail.com>)
List pgsql-novice
On Wed, Oct 25, 2023 at 9:13 AM o1bigtenor <o1bigtenor@gmail.com> wrote:
On Wed, Oct 25, 2023 at 9:55 AM David G. Johnston
<david.g.johnston@gmail.com> wrote:
>
> On Wed, Oct 25, 2023 at 5:21 AM Ibrahim Shaame <ishaame@gmail.com> wrote:
>>
>> But what I want to get is  grandfather - father - children:
>>
>> 1 - Grandfather1
>>
>> 3 - father1-1
>>
>> 6 - son1-1
>>
>> 7 – son1-2
>>
>> 4 - Father1-2
>>
>> 8 - son2-1
>>
>> 2 – Grandfather2
>>
>> 5 - Father2-1
>>
>> etc
>>
>>
>> Any suggestion
>>
>
> If you want a different ordering of the output change the ORDER BY specification.
>
> Specifically, you want to order by the path of each person.  Since that can only be determined during the traversal you need to create the path data yourself.  I suggest using an integer[] (integer array) to store the path using ID values as breadcrumbs.
>
>
(Not the OP just someone following the list trying to learn.)

'using ID values as breadcrumbs' - - - can I interpret that to mean
the ordinal numbers 1-8 listed (more implied)?


Yes, the numbers 1-8 are the values assigned to these 8 example individuals as their unique identifiers.

{1}
{1,3}
{1,3,6}
{1,3,7}
{1,4}
{1,4,8}
{2}
{2,5}

David J.

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