Correction exercice 3

db.inventory.updateMany( { qty: { $gte: 75 } }, { $set: { scores: [19] } } );

db.inventory.updateMany( { society: { $regex: /a/i } }, { $push: { scores: 11 } } );

db.inventory.find( { scores: 11 } );

db.inventory.updateMany( { society: "Alex" }, { $set: { comment: "Hello Alex" } } );

db.inventory.find( { comment: { $exists: false } } );