在 JSON 中创建嵌套数组

Question

我有一个这样的表结构：

我想以这种形式从这个表中创建一个 JSON：

{
    "EntityId": 100000,
    "Years": [
        {
            "Year": 2008,
            "Monthly": [
                {
                    "Month": 1,
                    "Count1": 49,
                    "Count2": 2
                },
                {
                    "Month": 2,
                    "Count1": 45,
                    "Count2": 1
                },
                .
                .
                .
            ]
        },
        {
            "Year": 2009,
            "Monthly": [
                {
                    "Month": 1,
                    "Count1": 36,
                    "Count2": 1
                },
                {
                    "Month": 2,
                    "Count1": 33,
                    "Count2": 0
                },
                .
                .
                .

            ]
        },
        .
        .
        .
        .
    ]
}

将始终针对单个 EntityId 查询此表。

我无法嵌套我的数组，年份也在重复（年份重复的次数是当年的月数，所以如果我有 2008 年的 12 个月数据，那么今年的数据重复 12 次）当我尝试以下查询时：

select f.EntityId, 
    (
        select TOP 1 [year] as [year],
        (
            select [month] as [month],
                [count1] as [count1],
                [count2] as [count2],
            from someTable m            
            where m.EntityId = f.EntityId and m.Year = y.Year 
            for json path
        ) as [months]
        from someTable y
        where y.EntityId = f.EntityId and y.Year = f.Year       
        for json path
    ) AS years
from someTable f 
where f.EntityId = f.EntityId   
for json path

Answer 1

试试这个。

    SELECT
        OuterData1,
        OuterData2,
        ,(SELECT InnerData1, InnerData2
            FROM Table2
            FOR JSON PATH) InnerJson
        OuterData3,
        OuterData4
    FROM Table1
    FOR JSON PATH