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Feat/postgres roadmap add new links group by (#7378)

* Add new links for group by for PostgreSQL

* Update article name

* Update src/data/roadmaps/postgresql-dba/content/grouping@uwd_CaeHQQ3ZWojbmtbPh.md

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Co-authored-by: dsh <daniel.s.holdsworth@gmail.com>
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@ -4,6 +4,8 @@ Grouping is a powerful technique in SQL that allows you to organize and aggregat
Learn more from the following resources:
- [@official@PostgreSQL GROUP BY CLAUSE](https://www.postgresql.org/docs/current/sql-select.html#SQL-GROUPBY)
- [@article@PostgreSQL GROUP BY](https://www.postgresqltutorial.com/postgresql-tutorial/postgresql-group-by/)
- [@article@PostgreSQL - GROUP BY](https://www.tutorialspoint.com/postgresql/postgresql_group_by.htm)
- [@article@PostgreSQL - HAVING](https://www.postgresqltutorial.com/postgresql-tutorial/postgresql-having/)
- [@article@PostgreSQL - HAVING](https://www.postgresqltutorial.com/postgresql-tutorial/postgresql-having/)
- [@video@PostgreSQL Group BY](https://www.youtube.com/watch?v=SI-bPx4jaGc)