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alindquist
New Member

Filter Data Table With Data From One SQL Table By Combo Box With Data From Another SQL Table

I built an app that connects to two tables in an Azure SQL database; [dbo].[Header] and [dbo].[Detail]. There is a one-to-many relationship between the two tables based on a column called ReportKey, which exists in both tables. I have a combo box to search for a specific value in a field (not the ReportKey) in the [dbo].[Header] table, and I display related values from the [dbo].[Detail] table in a Data Table object on the screen. I currently accomplish this with the following following formula in the Items property of the Data Table:

 

Filter('[dbo].[Detail]', ReportKey=LookUp('[dbo].[Header]', SONum=SOSearch_ComboBox.Selected.Result, ReportKey))

 

Essentially what I'm doing is using a combo box called "SOSearch_ComboBox" to search for a value in the SONum column of the [dbo].[Header] table, then looking up the related ReportKey column value in the [dbo].[Header] table, then filtering the [dbo].[Detail] table to only records where the value of ReportKey equals the value of ReportKey from the [dbo].[Header] table associated with the selected SONum. The current formula works great, but I have a delegation warning so now that I have reached 500 records the data table is not returning any values.

 

Is there a way to accomplish this same functionality while avoiding the delegation warning?

 

Here is an example of how the data looks:

 

alindquist_0-1619550771215.png

 

I need to be able to search for an SONum in the [dbo].[Header] table, then return the values from the [dbo].[Detail] table associated with that SONum. The expected results if I select SONum 456 (highlighted above) using the combo box would be a data table that looks like this:

 

alindquist_1-1619551042430.png

Note, when I say data table I'm referring to this object in Power Apps:

 

alindquist_2-1619551145279.png

 

Thanks in advance!

1 ACCEPTED SOLUTION

Accepted Solutions
RandyHayes
Super User
Super User

@alindquist 

So in your formula you are referencing Selected.Result.  This implies to me that you have a Distinct function in your Items property of the Combobox?  Why are you using Distinct?  Do you have duplicate SONum's in your table?  If not, I would consider removing that.

 

Then, your Items will be based on the table and you will already have the record in your Combobox, you don't need to look it up again.

So your Items property of the Table can simply be:

    Filter('[dbo].[Detail]', ReportKey=SOSearch_ComboBox.Selected.ReportKey)

 

I hope this is helpful for you.

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4 REPLIES 4
RandyHayes
Super User
Super User

@alindquist 

So in your formula you are referencing Selected.Result.  This implies to me that you have a Distinct function in your Items property of the Combobox?  Why are you using Distinct?  Do you have duplicate SONum's in your table?  If not, I would consider removing that.

 

Then, your Items will be based on the table and you will already have the record in your Combobox, you don't need to look it up again.

So your Items property of the Table can simply be:

    Filter('[dbo].[Detail]', ReportKey=SOSearch_ComboBox.Selected.ReportKey)

 

I hope this is helpful for you.

_____________________________________________________________________________________
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@RandyHayes you are correct, I am using the following formula in the Items property of my combo box:

 

Sort(Distinct('[dbo].[DiscrepancyHead]', SONum), Result, Ascending)

 

There shouldn't be duplicate SONum values in the header table, but it's technically possible. I tested removing the distinct and your suggestion worked great. I think I have enough other guard rails in place to prevent users from entering duplicate SONum values, so this solution should resolve my issue. Thanks!

 

I have a related follow up question. The [dbo].[Detail] table has a column called ErrorID that is a foreign key to a third table called [dbo].[ErrorCodes]. This third table has text descriptions for the ErrorID key field. In my Data Table of columns from [dbo].[Detail], I can add the ErrorID field but it just returns the numeric key field. What I really want is the text description from the [dbo].[ErrorCodes] table for that ErrorID. My current formula in the Items property of the Data Table is as follows (implementing your suggested change for my previous issue):

 

Filter(AddColumns('[dbo].[Detail]', "Error Code", LookUp('[dbo].[ErrorCodes]', ErrorID='[dbo].[Detail]'[@ErrorID], ErrorCodeDesc)), ReportKey=SOSearch_ComboBox.Selected.ReportKey)

 

This creates a new field that I'm able to add to the data table, which returns the text description of the error. Again, it works great but it has a delegation warning.

 

Here is an example of how the data looks:

 

alindquist_0-1619555551862.png

 

The expected results of the Data Table would look like this:

 

alindquist_1-1619555724179.png

 

Is there a way to accomplish this without the delegation warning? Sorry for piggybacking on my previous question.

RandyHayes
Super User
Super User

@alindquist 

Yes, so the key here is to work with information that you already have gathered.  Just like before, you already have the record information that you need.

 

So,

AddColumns(
    Filter('[dbo].[Detail]', 
        ReportKey=SOSearch_ComboBox.Selected.ReportKey
    ) As _item, 
    "Error Code", LookUp('[dbo].[ErrorCodes]', ErrorID=_item.ErrorID, ErrorCodeDesc) 
)

In this case, we are doing the Filter first because there is not sense in adding columns to all records and then filtering them out - that would waste performance.  So again, we filter the datasource by what will give us a set of results, then to that table of results, we add a new column called Error Code and perform the Lookup to the other table to get the description associated with the ErrorID of the filtered results.

 

See how that goes for you.

 

_____________________________________________________________________________________
Digging it? - Click on the Thumbs Up below. Solved your problem? - Click on Accept as Solution below. Others seeking the same answers will be happy you did.
NOTE: My normal response times will be Mon to Fri from 1 PM to 10 PM UTC (and lots of other times too!)
Check out my PowerApps Videos too! And, follow me on Twitter @RandyHayes

Really want to show your appreciation? Buy Me A Cup Of Coffee!

@RandyHayes this worked perfectly! Thank you so much for your help!

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