Looking for plpgsql book/guidance

Hi all, Looking for PostgrSQL plpgsql book/guidance. please guide me how can we become good plpgsql developer.

A good book you can consider to get started is :
PostgreSQL Server Programming - Second Edition
But apart from just one book being in community is most important to understand the latest developments. For example, older versions had only “functions” but
New Versions has “procedures” with transaction support within pl code. Upcoming version introduces “out” parameters. Reading more and more and involving in the community helps better.

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