SQL 使用记录变量

问题描述

我想计算存储在记录变量中的列的总和。这里是我的变量类型和信息：

我想找到 properties.value.float_value 的总和，其中 properties.key 等于“收入”。我的表名是“userevents”。

如何在 sql(bigquery) 中执行此操作？

解决方法

select sum(p.value.float_value) as float_value_sum
from `userevents`
left join unnest(properties) p
where p.key = 'revenue'

,

您可以使用标量子查询执行此操作，其中获取每一行的部分 SUM，然后使用外部 SUM 来聚合所有行：

WITH sample_row as (
    SELECT [
        STRUCT(
            STRUCT(
                3.14 as float_value,"foo" as string_value,16 as int_value
            ) as value,"revenue" as key
        ),STRUCT(
            STRUCT(
                1.23 as float_value,"bar" as string_value,12 as int_value
            ) as value,STRUCT(
            STRUCT(
                6.66 as float_value,"baz" as string_value,99 as int_value
            ) as value,"stuff" as key
        )
    ] as properties
)
SELECT SUM(
    (SELECT SUM(p.value.float_value) FROM UNNEST(properties) as p WHERE p.key = "revenue")
)
FROM sample_row