Cosmos DB - SQL - 获取所有唯一数组项和计数

Question

我有一个由

等项组成的 cosmos 数据库

{
    "id": 1
    "countries": [
    "Australia", 
    "New Zealand"
    ]
},
{
    "id": 2
    "countries": [
    "Australia", 
    "Antarctica"
    ]
}

我知道我可以通过

获得不同的值结果

SELECT DISTINCT country FROM country IN t.countries

哪些returns数据像

    {
        "country": "Australia"
    },
    {
        "country": "New Zealand"
    },
    {
        "country": "Antarctica"
    }

或

SELECT DISTINCT VALUE country FROM country IN t.countries

其中 returns 只是一个像

这样的数组

['Australia', 'New Zealand', 'Antarctica']

我将如何创建查询来获取数据，例如

    {
        "country": "Australia",
        "count": 2
    },
    {
        "country": "New Zealand",
        "count": 1
    },
    {
        "country": "Antarctica",
        "count": 1
    }

Answer 1

你可以用 GROUP BY 写这样的东西，

SELECT 
    COUNT(r) as Total,r as Country 
FROM c JOIN r IN c.countries 
GROUP BY r

结果，

[ { "Total": 1, "Country": "Antarctica" }, { "Total": 1, "Country": "New Zealand" }, { "Total": 2, "Country": "Australia" } ]

Cosmos DB - SQL - 获取所有唯一数组项和计数

Cosmos DB - SQL - Get All Unique Array Items and a count

sql

json

azure-cosmosdb

azure-cosmosdb-sqlapi