在Groovy中合并和聚合数据
我想知道在Groovy中聚合这些数据的最佳方法是什么 假设我有以下数据:在Groovy中合并和聚合数据,groovy,group-by,sum,aggregate,Groovy,Group By,Sum,Aggregate,我想知道在Groovy中聚合这些数据的最佳方法是什么 假设我有以下数据: [ [id: 1, name: bob, age:20, numberOfPackages: 10, numberOfPurchases:20 ], [id: 1, name: bob, age:20, numberOfPackages: 5, numberOfPurchases:6 ], [id: 2, name: Rob, age:22, numberOfPackages: 3, numberOfPu
[
[id: 1, name: bob, age:20, numberOfPackages: 10, numberOfPurchases:20 ],
[id: 1, name: bob, age:20, numberOfPackages: 5, numberOfPurchases:6 ],
[id: 2, name: Rob, age:22, numberOfPackages: 3, numberOfPurchases:5 ],
]
我想将其转换为以下内容(合并id/姓名/年龄,但合并价格/每个id的购买数量):
它可能是,例如:
def data = [
[id: 1, name: 'bob', age:20, price: 10, numberOfPurchases:20 ],
[id: 1, name: 'bob', age:20, price: 5, numberOfPurchases:6 ],
[id: 2, name: 'rob', age:22, price: 3, numberOfPurchases:5 ],
]
data.groupBy { it.id }.collectEntries {
[
(it.key): [
name: it.value.name.first(),
age: it.value.first(),
price: it.value.sum { it.price },
numberOfPurchases: it.value.sum { it.numberOfPurchases },
]
]
}
它可能是,例如:
def data = [
[id: 1, name: 'bob', age:20, price: 10, numberOfPurchases:20 ],
[id: 1, name: 'bob', age:20, price: 5, numberOfPurchases:6 ],
[id: 2, name: 'rob', age:22, price: 3, numberOfPurchases:5 ],
]
data.groupBy { it.id }.collectEntries {
[
(it.key): [
name: it.value.name.first(),
age: it.value.first(),
price: it.value.sum { it.price },
numberOfPurchases: it.value.sum { it.numberOfPurchases },
]
]
}
将价格和购买数量分别相加没有什么意义,你的意思是:
def data = [
[id: 1, name: 'bob', age:20, price: 10, numberOfPurchases:20],
[id: 1, name: 'bob', age:20, price: 5, numberOfPurchases:6],
[id: 2, name: 'rob', age:22, price: 3, numberOfPurchases:5]
]
data.groupBy { [id:it.id, name:it.name, age:it.age] }.collect { k, v ->
[id:k.id,
name:k.name,
age:k.age,
spend:v.collect { it.price * it.numberOfPurchases }.sum()]
}
其中:
[
[id:1, name:'bob', age:20, spend:230],
[id:2, name:'rob', age:22, spend:15]
]
将价格和购买数量分别相加没有什么意义,你的意思是:
def data = [
[id: 1, name: 'bob', age:20, price: 10, numberOfPurchases:20],
[id: 1, name: 'bob', age:20, price: 5, numberOfPurchases:6],
[id: 2, name: 'rob', age:22, price: 3, numberOfPurchases:5]
]
data.groupBy { [id:it.id, name:it.name, age:it.age] }.collect { k, v ->
[id:k.id,
name:k.name,
age:k.age,
spend:v.collect { it.price * it.numberOfPurchases }.sum()]
}
其中:
[
[id:1, name:'bob', age:20, spend:230],
[id:2, name:'rob', age:22, spend:15]
]
你想把价格加起来吗?不求和价格*每行的购买数量?如果任何答案符合您的期望,请接受。我想求和价格。为了避免混淆,我对示例进行了编辑。您想对价格求和吗?不求和价格*每行的购买数量?如果任何答案符合您的期望,请接受。我想求和价格。为了避免混淆,我编辑了这个例子。很好!但是,我刚才使用的值是虚拟示例值,这在实际案例场景中确实更有意义。我将编辑我的问题,使用一些更好的虚拟值。很好!但是,我刚才使用的值是虚拟示例值,这在实际案例场景中确实更有意义。我将编辑我的问题,以使用一些更好的虚拟值。