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https://www.dsfc.net/bdd/sql/sql-elimination-des-doublons-dune-table
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https://www.johndcook.com/blog/2019/12/31/sql-join-csv-files
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https://www.dsfc.net/infrastructure/b...recursive-parent-enfant-mysql-mariadb
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http://www.techrepublic.com/article/s..._medium=trueAnthem&utm_source=twitter
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http://pgphil.ovh/ecrire_optimiser_95_01.php
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https://evertpot.com/writing-sql-for-postgres-mysql-sqlite
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