$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }

How to Install PostgreSQL 13 on RHEL-based Distros

GNU/Linux RHEL-based Installing PostgreSQL 13 Guide

How to Install PostgreSQL 13 Database on RHEL-based GNU/Linux Distributions.

And to Install PostgreSQL 13 for CentOS you have first to setup the dnf Repository.

How to Install PostgreSQL 13 on CentOS GNU/Linux Distro

GNU/Linux RHEL-based PostgreSQL 13 Database Installation Guide

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