Open source alternatives to Microsoft SQL Server

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postgrespostgres/postgres

Mirror of the official PostgreSQL GIT repository. Note that this is just a *mirror* - we don't work with pull requests on github. To contribute, please see https://wiki.postgresql.org/wiki/Submitting_a_Patch

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servermariadb-13.0.2MariaDB/server

MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry.

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mysql-servermysql-cluster-26.10.0mysql/mysql-server

MySQL Server, the world's most popular open source database, and MySQL Cluster, a real-time, open source transactional database.