https://sql.sh/138-methode-supprimer-doublons

• SQL
• remove
• duplicates

http://fr.slideshare.net/ChristopherAdams5/a-related-matter-optimizing-your-webapp-by-using-djangodebugtoolbar-selectrelated-and-prefetchrelated

• django
• ORM
• SQL
• debug
• toolbar
• select_related
• prefetch_related
• performance

http://dev.mysql.com/tech-resources/articles/hierarchical-data.html

• database
• Hierarchical
• tree
• SQL
• howto