Alishka-databases-w4 #38
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sarlam
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Sep 12, 2024
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| Country: { $first: '$Country' }, | ||
| Year: { $first: '$Year' }, | ||
| Age: { $first: '$Age' }, | ||
| Male: { $sum: '$Male' }, | ||
| Female: { $sum: '$Female' }, | ||
| TotalPopulation: { $sum: { $add: ['$Male', '$Female'] } } |
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We are only looking for the total population, the rest should not be here as a group.
In addition, when you parse the CSV in importData.js and add it into your database you add the field M and F but no Male nor Female field.
| const collection = db.collection('populationData'); | ||
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| const result = await collection.aggregate([ | ||
| { $match: { Year: year, Age: age } }, |
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This query do not filter on the Country field, we would like to only see the continent
| { | ||
| $group: { | ||
| _id: '$Year', | ||
| countPopulation: { $sum: { $add: ['$Male', '$Female'] } } |
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according to importData.js you add the field M and F to your object but not Male nor Female
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