Question

多个左联接在Azure Stream Analytics中无法正常工作。

我正在Azure流分析中使用LEFT联接，并为前两个JOINS获取值，而其余LEFT JOIN为空值

以下是我使用的Json输入。


[
{"ID":"006XXXXX",
"ABC":
[{"E":1557302231320,"V":54.799999237060547}],
"XYZ":
[{"E":1557302191899,"V":31.0},{"E":1557302231320,"V":55}],
"PQR":
[{"E":1557302191899,"V":33},{"E":1557302231320,"V":15}],
"IJK":
[{"E":1557302191899,"V":65},{"E":1557302231320,"V":09}],

{"ID":"007XXXXX",
"ABC":
[{"E":1557302195483,"V":805.375},{"E":1557302219803,"V":0}],
"XYZ":
[{"E":1557302219803,"V":-179.0},{"E":1557302195483,"V":88}],
"PQR":
[{"E":1557302219803,"V":9.0},{"E":1557302195483,"V":98}],
"IJK":
[{"E":1557302219803,"V":1.0},{"E":1557302195483,"V":9}]
]

下面是我使用的查询。

WITH 
ABCINNERQUERY AS (
    SELECT
        event.ID as ID,
        event.TYPE as TYPE,
        ABCArrayElement.ArrayValue.E as TIME,
        ABCArrayElement.ArrayValue.V as ABC
    FROM
        [YourInputAlias] as event
    CROSS APPLY GetArrayElements(event.ABC) AS ABCArrayElement
),
XYZINNERQUERY AS (
    SELECT
        event.ID as ID,
        event.TYPE as TYPE,
        XYZArrayElement.ArrayValue.E as TIME,
        XYZArrayElement.ArrayValue.V as XYZ
    FROM
        [YourInputAlias] as event
    CROSS APPLY GetArrayElements(event.XYZ) AS XYZArrayElement
),
PQRINNERQUERY AS (
    SELECT
        event.ID as ID,
        event.TYPE as TYPE,
        PQRArrayElement.ArrayValue.E as TIME,
        PQRArrayElement.ArrayValue.V as PQR
    FROM
        [YourInputAlias] as event
    CROSS APPLY GetArrayElements(event.PQR) AS PQRArrayElement
),
IJKINNERQUERY AS (
    SELECT
        event.ID as ID,
        event.TYPE as TYPE,
        IJKArrayElement.ArrayValue.E as TIME,
        IJKArrayElement.ArrayValue.V as IJK
    FROM
        [YourInputAlias] as event
    CROSS APPLY GetArrayElements(event.IJK) AS IJKArrayElement
),
KEYS AS
(
    SELECT 
        ABCINNERQUERY.ID AS ID, 
        ABCINNERQUERY.TIME as TIME
    FROM ABCINNERQUERY
        UNION 
    SELECT 
        XYZINNERQUERY.ID AS ID, 
        XYZINNERQUERY.TIME as TIME
    FROM XYZINNERQUERY
    UNION
    SELECT 
        PQRINNERQUERY.ID AS ID, 
        PQRINNERQUERY.TIME as TIME
    FROM PQRINNERQUERY
    UNION
    SELECT 
        IJKINNERQUERY.ID AS ID, 
        IJKINNERQUERY.TIME as TIME
    FROM IJKINNERQUERY
)

SELECT
    KEYS.ID as ID,
    KEYS.TIME as TIME,
    ABCINNERQUERY.ABC AS ABC,
    XYZINNERQUERY.XYZ AS XYZ,
    PQRINNERQUERY.PQR AS PQR,
    IJKINNERQUERY.IJK AS IJK
INTO [YourOutputAlias] 
FROM KEYS
    LEFT JOIN ABCINNERQUERY
    ON DATEDIFF(minute, KEYS, ABCINNERQUERY) BETWEEN 0 AND 10
    AND KEYS.ID = ABCINNERQUERY.ID
    AND KEYS.TIME = ABCINNERQUERY.TIME
    LEFT JOIN XYZINNERQUERY
    ON DATEDIFF(minute, KEYS, XYZINNERQUERY) BETWEEN 0 AND 10
    AND KEYS.ID = XYZINNERQUERY.ID
    AND KEYS.TIME = XYZINNERQUERY.TIME
    LEFT JOIN PQRINNERQUERY                                         ---From here onwards JOIN will not work. Only first two joins are working as expected.
    ON DATEDIFF(minute, KEYS, PQRINNERQUERY) BETWEEN 0 AND 10
    AND KEYS.ID = PQRINNERQUERY.ID
    AND KEYS.TIME = PQRINNERQUERY.TIME
    LEFT JOIN IJKINNERQUERY                                         ---Once we shift this join to 1st or 2nd then it will work.
    ON DATEDIFF(minute, KEYS, IJKINNERQUERY) BETWEEN 0 AND 10
    AND KEYS.ID = IJKINNERQUERY.ID
    AND KEYS.TIME = IJKINNERQUERY.TIME

实际结果如下。

ID           STIME                  ABC      XYZ    PQR IJK
006XXXXX    1557302231320.00    54.79999924    31   null    null
006XXXXX    1557302191899.00    null            31  null    null
007XXXXX    1557302195483.00    805.375         88  null    null

对应时间的PQR和IJK的期望值。

Answer 1

我跟踪了您的示例数据并得到了0行。请注意，您在示例数据中提供的值不正确。

09不能为数字类型序列化。我修复了sql对我有用的问题。

多个LEFT JOINS无法在Azure流分析中按预期方式工作

1 个答案: