Applying filtered rows to the source

[jader3rd]

I'm connecting to a SQL view which has a lot of rows. Most of the time when we view the data we're going to be most interested in the last week or twos worth of data. I created StartTime and EndTime parameters and have them filter out rows as part of the query. I'm beginning to suspect that it's not working how I thought it would though. I suspect what's happening is that Power BI is querying the entire SQL view, grabbing the first 100,000 (or whatever) rows returned, and then applying the filter. The result being that there are days' worth of rows not showing up in the Power BI report, but I can see them when doing a query in SQL Server Management Studio.

So is there a way to push the Power BI parameters, into the Source of the Power BI query, (a simple WHERE clause), to filter out the rows from the SQL query?

[v-yuezhe-msft]

Hi @jader3rd,

Open Power BI Desktop, and choose “Get Data->Blank query”, then click Advanced Editor, paste the following code in it.

let
    SQLSource = (param1 as date, param2 as date) =>

let
    Source = Sql.Database("servername", "databasename", [Query="select * from viewname where DateColumn>='"& Date.ToText(param1) & "' and DateColumn <='" & Date.ToText(param2)&"'"])

in
    Source
in
    SQLSource

Then you can enter parameter values and click “Invoke” button to generate filtered table.

Regards,
Lydia Zhang

[jader3rd]

I'm so excited that this could work.

This is what I have.

let
    SQLSource = (StartTime as datetime, EndTime as datetime) => 
let
    Source = Sql.Database("MF-APDM-Shared1AlwaysOnVIP.OBDStripeDedicated-Prod-Bn2.Bn2.ap.gbl,89", "MDP_EXOMI", [Query="SELECT CONVERT(DATE, [START_TIME]) AS Day, [ACTION_REASON], [CHECKFAILED], COUNT(*) AS Cnt FROM [dbo].[HAOpBcsFailed] WHERE [START_TIME] >= '"& Date.ToText(StartTime) & "' AND [START_TIME] <= '"& Date.ToText(EndTime)&"' GROUP BY CONVERT(DATE, [START_TIME]), [ACTION_REASON], [CHECKFAILED]"]) 
in
    Source
in 
    SQLSource

And here's the error

An error occurred in the ‘HAOpBcsFailedFunc’ query. Expression.Error: We cannot convert the value #datetime(2017, 5, 1, 0, 0, 0) to type Date.
Details:
    Value=5/1/2017 12:00:00 AM
    Type=Type

[v-yuezhe-msft · Accepted solution]

@jader3rd,

Change your codes to the following.

let
    SQLSource = (StartTime as datetime, EndTime as datetime) => 
let
    Source = Sql.Database("MF-APDM-Shared1AlwaysOnVIP.OBDStripeDedicated-Prod-Bn2.Bn2.ap.gbl,89", "MDP_EXOMI", [Query="SELECT CONVERT(DATE, [START_TIME]) AS Day, [ACTION_REASON], [CHECKFAILED], COUNT(*) AS Cnt FROM [dbo].[HAOpBcsFailed] WHERE [START_TIME] >= '"& DateTime.ToText(StartTime) & "' AND [START_TIME] <= '"& DateTime.ToText(EndTime)&"' GROUP BY CONVERT(DATE, [START_TIME]), [ACTION_REASON], [CHECKFAILED]"]) 
in
    Source
in 
    SQLSource

Regards,
Lydia

[TDwivedi]

@v-yuezhe-msft 

Hi, 

In my case I need to get first parameter from Database itself which I can't have as inner query due to some Cosmos limitation. 

SQL 1 - First query is to get the max of column value  - select max(column) from table

SQL 2 - select * from table where id = Value received from first query

Thank you in advance

[jader3rd]

To show what I'm seeing, here are the numbers from Power BI desktop:

StartDate	Count of OP_ID
5/1/2017 0:00	7599
5/2/2017 0:00	6510
5/3/2017 0:00	7687
5/4/2017 0:00	12801
5/5/2017 0:00	13200
5/6/2017 0:00	17838
5/7/2017 0:00	11555
5/8/2017 0:00	7494
5/9/2017 0:00	9311
5/10/2017 0:00	12743
5/11/2017 0:00	15495
5/12/2017 0:00	13319
5/13/2017 0:00	12553
5/14/2017 0:00	7402

And here are the numbers from a SQL query doing what I expect Power BI is doing. They are very different.

StartDate	C
5/1/2017	128627
5/2/2017	113405
5/3/2017	139923
5/4/2017	180977
5/5/2017	170624
5/6/2017	261793
5/7/2017	150938
5/8/2017	61490
5/9/2017	144524
5/10/2017	134023
5/11/2017	173369
5/12/2017	174371
5/13/2017	231799
5/14/2017	174641
5/15/2017	112142
5/16/2017	167455