在 Azure 流分析查询中重用子查询的结果

Question

我正在使用 Azure 流分析，但在查询部分遇到了一些问题。这是我的代码。

WITH subquery as (
    SELECT 
    messageId,
    deviceId,
    temperature, 
    humidity,
    EventProcessedUtcTime,
    DemoML(temperature, humidity) as result1
    from DemoInput
    )

SELECT
    messageId as messageId,
    deviceId as deviceId,
    temperature as temperature,
    humidity as humidity,
    EventProcessedUtcTime as EventProcessedUtcTime,
    result1.[Scored Labels] as result,
    result1.[Scored Probabilities] as resultProbability
INTO
    [DemoOutput]
FROM
    [subquery]


SELECT
    result1
INTO
    [c2d]
FROM
    [subquery] 

DemoML 是一个返回结果的函数。我想将 result1 放入两个不同的输出中。但我只设法将 result1 放入一个输出中。我怎样才能做到这一点？我对 SQL 完全陌生。

Answer 1

您可以使用INSERT ... OUTPUT ... INTO ... SELECT 插入两次：

WITH subquery as (
    SELECT 
    messageId,
    deviceId,
    temperature, 
    humidity,
    EventProcessedUtcTime,
    DemoML(temperature, humidity) as result1
    from DemoInput
    )
INSERT INTO target_1(col1,...)
OUTPUT inserted.col1, ...
INTO target_2(col1, ..)
SELECT
    messageId as messageId,
    deviceId as deviceId,
    temperature as temperature,
    humidity as humidity,
    EventProcessedUtcTime as EventProcessedUtcTime,
    result1.[Scored Labels] as result,
    result1.[Scored Probabilities] as resultProbability
FROM  [subquery];

简化：

CREATE TABLE t1(i INT);
CREATE TABLE t2(i INT);
CREATE TABLE src(i INT);
INSERT INTO src(i) VALUES(10),(20);

INSERT INTO t1(i)                 -- target one
OUTPUT inserted.i
INTO t2(i)                        -- target two
SELECT i
FROM src;

DBFiddle Demo