从 COSMOS db 查询访问选择性数组项

Question

我需要从 cosmos db 集合中的以下数组中获取一些选择性数组项。

“详情”：[ {

            "name": "a",
            "roll_no": 100,
            "sub":"maths",
            "class":"3"
           
        },
        {
           
            "name": "b",
            "roll_no":"512",
            "sub":"eng",
            "class":"5"
           
        },
         {
           
            "name": "c",
            "roll_no":"512",
            "sub":"eng",
            "class":"7"
           
        }
        and so on

期望的输出是：

“详情”：[ {

            "name": "a",
            "roll_no": 100,
            
           
        },
        {
           
            "name": "b",
            "roll_no":"512",
            
           
        },
         {
           
            "name": "c",
            "roll_no":"512",
            
           
        }
        and so on

如何在 cosmosb 数据库中编写相同的查询？

Answer 1

使用子查询和 ARRAY 函数将起作用：

SELECT c.id, ARRAY(SELECT d.name, d.roll_no FROM d in c.details) AS details
FROM c