Azure 流分析的嵌套条件

Question

我有两个问题：

1. Azure Stream 分析是否支持使用 CASE 语句的嵌套条件？
2. 我看到这里提到了 2 种格式的 CASE 表达式 - https://docs.microsoft.com/en-us/stream-analytics-query/case-azure-stream-analytics . I found examples for searched CASE here。谁能给出简单 CASE 表达式的例子？

Answer 1

示例数据：

[{
"id": "0001",
"type": "donut",
"name": "Cake"
},
{
"id": "0002",
"type": "donut2",
"name": "Cake2"
]

Does azure Stream analytics support nested conditions using the CASE statement ?

根据我的测试，它支持嵌套条件。

SQL:

select jsoninput.id as id, jsoninput.type as type ,
case when 
    ((case when  jsoninput.id = '0001' then '0' else '1' end) = '0' ) then '0'
else  '1' end as res
from jsoninput

输出：

Can anyone give example for the Simple CASE expression?

SQL:

select jsoninput.id as id, jsoninput.type as type ,
case jsoninput.id when '0001' then 'true' else 'false' end as res 
from jsoninput

输出：