满足 Azure 流分析 SAQL 条件时的默认字段值

Question

我需要根据文档中可用的另一个字段的值来设置一个字段的值。

下面是我为获取需求而尝试的 SAQL。

WITH INPUT01 AS (
    SELECT
        input.id AS ID,
        ROUND(input.sig,5) AS SIG,
        input.dtcTriggeredDateTime.dateTime.time AS TIME,
        input.Description as DESC
        FROM [inputsignals] as input
    WHERE GetArrayLength(input.abc) =0 AND (input.Description = 'xyz' OR input.Description = 'pqr')

SELECT 
    ID,
    SIG,
    TIME,
    001 AS NUMID 
INTO [cosmosDB]
FROM INPUT01
WHERE DESC = 'abc'

SELECT 
    ID,
    SIG,
    TIME,
    002 AS NUMID 
INTO [cosmosDB]
FROM INPUT01
WHERE DESC = 'pqr'

如果 DESC 是 abc 那么 NUMID 应该是 001 如果 DESC 是 pqr 那么 NUMID 应该是 002.

除了单独编写最后两个 select 语句之外，是否有任何选项可以将其写入单个 SELECT 查询中，如下所示？

SELECT 
    ID,
    SIG,
    TIME,
    001 AS NUMID  (If DESC = abc)
    002 AS NUMID  (If DESC = pqr)
INTO [cosmosDB]
FROM INPUT01

Answer 1

请在 SA SQL:

中使用 CASE...WHEN... 运算符

SELECT
    CASE
      WHEN DESC = 'abc' THEN 001
      WHEN DESC = 'pqr' THEN 002 
   END as NUMID  
FROM INPUT01

满足 Azure 流分析 SAQL 条件时的默认字段值

Default field value if a condition satisfies in Azure Stream Analytics SAQL

azure

azure-stream-analytics

stream-analytics

azure-cosmosdb