| From: | Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> |
|---|---|
| To: | Junwang Zhao <zhjwpku(at)gmail(dot)com> |
| Cc: | Vik Fearing <vik(at)postgresfriends(dot)org>, Ajay Pal <ajay(dot)pal(dot)k(at)gmail(dot)com>, Imran Zaheer <imran(dot)zhir(at)gmail(dot)com>, Peter Eisentraut <peter(at)eisentraut(dot)org>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: SQL Property Graph Queries (SQL/PGQ) |
| Date: | 2024-12-16 10:14:04 |
| Message-ID: | CAExHW5uA3xwiqCSXz7snCcRBhNe5A-rPTsKS+pUHhE07uJi-Yg@mail.gmail.com |
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| Lists: | pgsql-hackers |
Hi Junwang,
>
> I'm looking at the catalog definition, I have some questions which
> might be silly.
Thanks for your interest in SQL/PGQ.
>
> Each pg element can have multiple labels(whose properties belong
> to the same pg element), can we have multiple elements share the
> same label?
Yes. A label can be shared between edges and vertices as well.
>
> If we have a 1..* relation between element and label, I think maybe
> we don't need _pg_propgraph_label_.
pg_propgraph_label is used to map a label name in a given property
graph to its OID. pg_propgraph_element_label - can be used to find all
the elements with a given label and all the labels of a given element.
The relationship is many to many.
>
> From the name _pg_propgraph_label_property_, I tend to think it is
> referencing _pg_propgraph_label_, but actually it is referencing
> _pg_propgraph_element_label_.
>
Right.
--
Best Wishes,
Ashutosh Bapat
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