There is an excellent online book here: http://www.interdb.jp/pg/
You can download a some free books here:
https://www.topfreebooks.org/tag/postgresql/
For the newer releases, you can always buy "Mastering PostgreSQL 11" or
"Mastering PostgreSQL 12" on Amazon. However, if your hope is to replace
Oracle by PostgreSQL to reduce costs, forget it. Oracle is still much
more capable and it's much easier to find programmers who know Oracle
than programmers who know PostgreSQL. Unfortunately, no open source DB
can adequately replace Oracle. There are other commercial databases,
like DB2 and SQL Server, which can do that, but they are not free.
On 2/3/20 5:54 PM, Vijay Sehgal wrote:
Dear Experts,--
Wanted to know if any of you has recommendations for books or online trainings
to learn PostgreSQL, any authors in PostgreSQL world like Jonathan Lewis,
Christian Antognini to name just few amongst many SME we have here.
Thanks for your time.
Regards,
Vijay Sehgal--
//www.freelists.org/webpage/oracle-l