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      <title>Django Window Function vs GROUP BY : QuerySets chaînables</title>
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      <description>Maîtrisez Django Window Function vs GROUP BY : gardez vos lignes intactes, chaînez filter() et select_related() sans perdre vos données.</description>
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      <description>Django in_bulk() retourne un dict {id: instance} en une requête SQL. Optimisation ORM concrète : accès O(1), zéro N&#43;1, idéal pour imports et synchros.</description>
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