Selecting temp tables & CTEs using PowerBI

  • I have a pretty difficult assignment. This is the structure that I need to have (or smth very close to it). I need to have 4 temp tables in one query. I am droping them each time I am running and each of those temp tables consists of CTEs inside.

    The schema is below.

    This works just fine in SQL Server Management Studio. But when I try to add it to PowerBI I am getting an error:

    I really don't understand why PowerBI doesn't accept it. Does someone know what can cause the issue in PowerBI while SQL Server does accept it?

    Issue1

     

    if object_id('TempDB..##t1','U') IS NOT NULL
    drop table ##t1;
    if object_id('TempDB..##t2','U') IS NOT NULL
    drop table ##t2;
    if object_id('TempDB..##t3','U') IS NOT NULL
    drop table ##t3;
    if object_id('TempDB..##t4','U') IS NOT NULL
    drop table ##t4;



    ;with cte1 AS (select)

    , cte2 AS (select)

    , cte3 AS (select)

    , cte4 AS (select ... INTO ##t1 )

    ;with cte1 AS (select)

    , cte2 AS (select)

    , cte3 AS (select)

    , cte4 AS (select ... INTO ##t2 )

    ;with cte1 AS (select)

    , cte2 AS (select)

    , cte3 AS (select)

    , cte4 AS (select ... INTO ##t3 )

    ;with cte1 AS (select)

    , cte2 AS (select)

    , cte3 AS (select)

    , cte4 AS (select ... INTO ##t4 )



    and then I create new CTEs from where I am selecting
    ;with cte1 ( select various fields from diff tables )
    , cte2 ( select various fields from diff tables )
    , cte3 ( select various fields from diff tables )
    , cte4 ( select various fields from diff tables )

     

    Works in SQL, doesn't work in PowerBI.

  • Thanks for posting your issue and hopefully someone will answer soon.

    This is an automated bump to increase visibility of your question.

  • Sounds rather complex. You might be better off putting this into a view or stored procedure.

    Are you using global temp tables rather than local ones for a reason? Local temp tables are usually to be preferred in code like this.

    Presumably you are using Direct Query?

    How long does the query take to run in SSMS? Did you set the command timeout to be longer than this?

    If you haven't even tried to resolve your issue, please don't expect the hard-working volunteers here to waste their time providing links to answers which you could easily have found yourself.

  • Create a stored procedure that creates and uses all the temp tables you want. Then at the end return records from your temp tables.

    In PowerBI, Get Data -> From SQL Server -> Specify the Connection to the server, and then click the Down Arrow next to Advanced Options. In the box that magically appears, call your stored procedure.

    EXEC MyDb.SchemaName.StoredProcName @Param1=....

    Just to make sure I wasn't making anything up, I created a dummy stored procedure to return data from a temp table. (Yes, I am fully aware that this is the DUMBEST stored procedure I've probably ever written. Feels a bit tortured, like the plots in Cervantes' Exemplary Novels, but anyway... Here's a stored procedure that creates and populates a temp table, uses it in the stored procedure to join to a bunch of Common Table Expressions. Just to prove it can be done, and consumed in PowerBI.

    CREATE PROC StoredProcWithTempTables
    AS
    BEGIN
    CREATE TABLE #T(ID INT, Firstname VARCHAR(20));
    INSERT INTO #T VALUES (1,'Joe'),(2,'Fred'),(3,'Bill');

    SELECT *
    FROM #T;
    DROP TABLE #T;
    END

    and that was fine. The values I inserted are returned. So it's not temp table that's the problem.

    I think the whole CTE thing is a red herring. As long as you define them all in one statement, it should be fine. So I tried it... like this. (Yes, I know, it's a completely absurd query, but that's beside the point)

    CREATE PROC HeartDataNoDuplicates
    AS
    WITH cteHeartData(PatientID, SymptomName,Severity, ConsentDate, dupeNo)
    AS
    (SELECT Individual_ID,
    Long_name,
    Delivery_level,
    Consent_date,
    ROW_NUMBER() OVER (PARTITION BY Individual_ID, Long_Name ORDER BY Consent_Date)
    FROM dbo.SekouTestData td),

    cteMultiSymptomPatients(PatientID)
    AS (
    SELECT Individual_ID
    FROM dbo.SekouTestData td2
    GROUP BY Individual_ID
    HAVING COUNT(DISTINCT(Long_Name))>1
    )
    SELECT msp.PatientID, hd.ConsentDate, hd.SymptomName, hd.Severity
    FROM cteHeartData hd
    INNER JOIN cteMultiSymptomPatients msp
    ON hd.PatientID = msp.PatientID;

    So that's the "it doesn't work with a CTE" claim dealt with. Oh, a Temp table.

    CREATE PROC HeartDataNoDuplicates3
    @MinSeverity TINYINT
    AS
    /*
    create a temp table and join to it...
    */
    DROP TABLE IF EXISTS #SamplePatients;

    CREATE TABLE #SamplePatients (PatientID INT);
    /* pick 50 random multi-symptom patients */

    INSERT INTO #SamplePatients
    SELECT TOP 50 Individual_ID
    FROM SekouTestData std
    GROUP BY Individual_ID, Long_Name
    HAVING COUNT(*)>1
    ORDER BY NEWID();

    WITH cteHeartData(PatientID, SymptomName,Severity, ConsentDate, dupeNo)
    AS
    (SELECT Individual_ID,
    Long_name,
    Delivery_level,
    Consent_date,
    ROW_NUMBER() OVER (PARTITION BY Individual_ID, Long_Name ORDER BY Consent_Date)
    FROM dbo.SekouTestData td)

    SELECT hd.ConsentDate, hd.SymptomName, hd.Severity
    FROM cteHeartData hd
    INNER JOIN #SamplePatients sp
    ON hd.PatientID = sp.PatientID
    WHERE hd.Severity>@MinSeverity;

    If you're declaring multiple CTEs, just have commas between each definition, and then use them in the final SELECT, and it should work fine. If that doesn't solve your problem, post your CTEs.

     

    • This reply was modified 1 month, 3 weeks ago by  pietlinden.
    • This reply was modified 1 month ago by  pietlinden.
    • This reply was modified 1 month ago by  pietlinden.
  • I had similar issues using OLE DB driver in Power BI.  Give it a try with SQL Server Native Client driver.

     

    ---------------------------------------------------------------------------------------------------------------------------------IrfanHyd

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