Database

Postgres: role “postgres” does not exist

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Fix FATAL: role “postgres” does not exist with Postgres.app on MacOs

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How to change the decimal separator without changing the representation in the Postgres database

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How to connect to Liferay’s embedded Hypersonic DB (jdbc:hsqldb:file:…;readonly=true) to inspect data.

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Step-by-step commands to upgrade PostgreSQL clusters between versions on Ubuntu.

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SQL query example to list Oracle resource limits (processes, sessions) when not unlimited.