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mongodb « mon "Blog Note" partagé :-)

Articles contenant le tag mongodb

MongoDB

Posté par D.E.S. dans Other le 10 décembre 2019

Voir la doc… hahaha… Quelques requêtes ci-dessous…

Requête pour trouver des doublons sur un index et nettoyer la donnée avant contrainte d’unicité.

Le principe est

de remonter les objets avec un élément les caractérisant (type?) et de les grouper par identifiant + compter le nombre d’occurences.
de garder les identifiants qui sont trouvés plus d’une fois
regrouper par nombre d’occurences les identifiants

[{
    $group: {
        _id: "$idOuvrage",
        niveau: {
            $first: "$niveau"
        },
        count: {
            $sum: 1
        }
    }
}, {
    $match: {
        count: {
            $gt: 1
        }
    }
}, {
    $group: {
        _id: "$count",
        niveau: {
            $first: "$niveau"
        },
        ids: {
            $push: "$_id"
        }
    }
}]


                      it, mongodb
                    
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