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For this lab we will use a Postgresql database, with a wrapper called \emph{kDB} which provides ROS services for executing SQL and SPARQL queries.
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For this lab, we will only use the SPARQL part.
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The following command will start the database:
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The following command will start the database (you should add it to your screen):
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```bash
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ros2 run ros2_kdb server
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