我想根据currency
获取emp salary
的最大值和最小值。每个员工都有一个基于货币的薪资范围,并且所有响应的详细信息都应该是唯一的。虽然我使用聚合函数 min 和 max 但它获取工资金额的最大值和最小值,但我需要根据 currency
字段获取最大值和最小值。
示例数据:
[
{
"id": "1",
"emp_name": "emp1",
"data": [
{
"emp_country": "country1",
"emp_city": "city1",
"salary": [
{
"currency": "INR",
"amount": 5000
},
{
"currency": "INR",
"amount": 600
},
{
"currency": "MXN",
"amount": 400
}
]
},
{
"emp_country": "country1",
"emp_city": "city2",
"salary": [
{
"currency": "DOLLER",
"amount": 5000
},
{
"currency": "DOLLER",
"amount": 200
},
{
"currency": "MXN",
"amount": 400
}
]
}
]
},
{
"id": "2",
"emp_name": "emp2",
"data": [
{
"emp_country": "country2",
"emp_city": "city2",
"salary": [
{
"currency": "INR",
"amount": 5000
},
{
"currency": "MXN",
"amount": 200
},
{
"currency": "MXN",
"amount": 400
}
]
}
]
},
{
"id": "3",
"emp_name": "emp3",
"data": [
{
"emp_country": "country1",
"emp_city": "city1",
"salary": [
{
"currency": "MXN",
"amount": 400
}
]
}
]
},
{
"id": "4",
"emp_name": "emp4",
"data": [
{
"emp_country": "country1",
"emp_city": "city2",
"salary": [
{
"currency": "DOLLER",
"amount": 200
}
]
}
]
}
]
预期输出: 城市,国家,名称应该是唯一的,工资有基于货币的最大和最小。
[
{
"emp_city": "city1",
"emp_country": "country1",
"emp_name": "emp1",
"emp_salary": [{
"currency": "INR",
"max": 5000,
"min": 600
},
{
"currency": "MXN",
"max": 400,
"min": 400
}]
},
{
"emp_city": "city2",
"emp_country": "country1",
"emp_name": "emp1",
"emp_salary":[ {
"currency": "DOLLER",
"max": 5000,
"min": 200
},
{
"currency": "MXN",
"max": 400,
"min": 400
}]
},
{
"emp_city": "city2",
"emp_country": "country2",
"emp_name": "emp2",
"emp_salary": [{
"currency": "INR",
"max": 5000,
"min": 5000
},
{
"currency": "MXN",
"max": 400,
"min": 200
}]
},
{
"emp_city": "city1",
"emp_country": "country1",
"emp_name": "emp3",
"emp_salary": [{
"currency": "MXN",
"max": 400,
"min": 400
}]
},
{
"emp_city": "city2",
"emp_country": "country1",
"emp_name": "emp4",
"emp_salary": [{
"currency": "DOLLER",
"max": 200,
"min": 200
}]
}
]
最佳答案
我们可以使用聚合查询来实现上述结果。
$unwind
- 解构工资数组$group
- 按雇员城市、国家/地区、姓名、货币以及工资的最小值和最大值进行分组$group
- 使用另一个推送 emp_salary$project
- 以您的格式显示字段
db.collection.aggregate([
{
"$unwind": {
"path": "$data"
}
},
{
"$unwind": {
"path": "$data.salary"
}
},
{
"$group": {
"_id": {
"emp_city": "$data.emp_city",
"emp_country": "$data.emp_country",
"emp_name": "$emp_name",
"currency": "$data.salary.currency",
},
"max": {
"$max": "$data.salary.amount"
},
"min": {
"$min": "$data.salary.amount"
}
}
},
{
"$group": {
"_id": {
"emp_city": "$_id.emp_city",
"emp_country": "$_id.emp_country",
"emp_name": "$_id.emp_name",
},
"emp_salary": {
"$push": {
"currency": "$_id.currency",
"min": "$min",
"max": "$max"
}
}
}
},
{
"$project": {
"_id": 0,
"emp_city": "$_id.emp_city",
"emp_country": "$_id.emp_country",
"emp_name": "$_id.emp_name",
"emp_salary": 1,
}
}
])
关于java - 如何根据特定键获取 MongoDB 中的最大值和最小值?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/68993192/