cancel
Showing results for
Did you mean:
Kudo Collector

Find next available number in a list?

I need to find the next available number in a list. This is not the same as finding the highest number and adding 1. For example, I have the following numbers in my database:

• 1000011
• 1000045
• 1005646
• 1006565
• 1568795
• 1894834

The first and last digit are meaningful, but the middle 5 are not. So the "core numbers" would be:

• 00001
• 00004
• 00564
• 00565
• 56879
• 89483

In Excel, I'd simply use PowerQuery to generate a list of numbers 00001 - 99999, then do an antijoin to only keep numbers in my big list that aren't in the original list, then pick the minimum number. Which, in this case, would be 00002.

If that were added to the database then, 00003 would be next, then 00005, as an 00004 already exists.

Getting the core number in PowerApps is easy - the MID() function.

I cannot figure out how to do the logic though to start moving through those numbers to find the first available number.

Ideas where to start?

1 ACCEPTED SOLUTION

Accepted Solutions
Power Apps

This can be done natively in PowerApps, using a logic similar to the one you described. The main problem here is to create the list of numbers from 1 to 99999 - there's nothing in PowerApps that can do that, but you can do it "by hand" (or using code) by using this construct:

`[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,...]`

Here's the expression that would give you the "next" number (assuming that the numbers are stored in a collection or a table called 'numbersInDatabase'):

```First(
Filter(
[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30],
numbersInDatabase,
"CoreValue",
Value(Mid(Text(Value), 2, Len(Text(Value)) - 2))).CoreValue)),
).Value```

The idea is to extract the value from the original table, and use the Not operator with the in operator to implement the anti-join pattern that you mentioned, then taking the first of the remaining values.

The attached app shows how this can be implemented; to open it save it locally, then go to https://create.powerapps.com, select Open, then Browse, then find the file that you saved before.

Another alternative that you can use instead of creating a list of all 100k numbers, is to have a list of ~100 (or 1000) numbers that start with the next available number, and every time you add a new number, you "shift" the list to start from that number. The attached app also shows this alternative.

Hope this helps!

11 REPLIES 11
Community Champion

Hi @EdHansberry ,

Initially, i'm thinking of the string manipulation functions like Split(), Len(), Right(), Left() etc. You can wrap the results of these manipulations in Value() to perform numeric calculations on them once you have em' cornered.

Good luck!
Let us know what you end up with! Thats a cool problem

Kudo Collector

Yeah. Converting from numbers to text and back are not the problem. A Do-While loop would work, but that doesn't exist in PowerApps. Nor, to my knowledge, the ability to create an array of sequential numbers. Kinda stumped.

Impactful Individual

You say database.  What type of database?  Is it SQL Server?  You could write a stored procedure and call it from Flow.

Kudo Collector

Right now it is an Excel file as the database. It will be in SQL Server, but I don't know anything about writing stored procedures, or doing SQL stuff natively in SQL server. I use SSMS sparingly, and use PowerQuery for all of my data transformational needs.

I'm hoping for a native PowerApps solution.

Impactful Individual

Doing what you want requires a procedural language.  The M-Language is pretty powerful and provides a lot of interesting capabilities.  Stored procedures are not that difficult to learn and if you are going to use SQL Server for anything significant you are likely going to need them for other purposes.

Community Champion

Mmmm. I’m fairly certain you can do something like (pseudo code here cuz I’m on my phone):
Sort(
Mid(<midStuff>), Ascending)
)

Basically, for all the numbers in the given column, peel off the first and last numbers, sort the results in ascending order.
I’m fact, I’m certain I’ve seen this somewhere in the forums here.

Community Champion
Power Apps

This can be done natively in PowerApps, using a logic similar to the one you described. The main problem here is to create the list of numbers from 1 to 99999 - there's nothing in PowerApps that can do that, but you can do it "by hand" (or using code) by using this construct:

`[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,...]`

Here's the expression that would give you the "next" number (assuming that the numbers are stored in a collection or a table called 'numbersInDatabase'):

```First(
Filter(
[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30],
numbersInDatabase,
"CoreValue",
Value(Mid(Text(Value), 2, Len(Text(Value)) - 2))).CoreValue)),
).Value```

The idea is to extract the value from the original table, and use the Not operator with the in operator to implement the anti-join pattern that you mentioned, then taking the first of the remaining values.

The attached app shows how this can be implemented; to open it save it locally, then go to https://create.powerapps.com, select Open, then Browse, then find the file that you saved before.

Another alternative that you can use instead of creating a list of all 100k numbers, is to have a list of ~100 (or 1000) numbers that start with the next available number, and every time you add a new number, you "shift" the list to start from that number. The attached app also shows this alternative.

Hope this helps!

Community Support

Hi @EdHansberry ,

Could you please share a bit more the data structure of your Original List and Big List?

Further, do you want to find the next available minimum number within your Original List?

I assume that you add a Text type column to store the list of numbers 00001 - 99999 in your Big List, is it true?

I have made a test on my side, please take a try with the following workaround:

Set the OnStart property of the App control or OnVisible property of the first screen of your app to following:

`ClearCollect(OriginalList, 1000011, 1000045, 1005646, 1006565, 1568795, 1894834);ClearCollect(BigList, "00001", "00002", "00003", "00004", "00005", "00007", "00006","00008","00010","00009")`

Set the Text property of the Label control to following:

`First(       SortByColumns(                     AddColumns(Filter(BigList, Not(Text(Value) in Mid(AddColumns(OriginalList,"TextValue",Text(Value)).TextValue,2,5))), "IntegerValue", Value(Value)),                     "IntegerValue",                      Ascending       )).Value`

On your side, you should type the following:

```First(
SortByColumns(
"IntegerValue",
Ascending
)
).BigNumberColumn```

Note: The BigNumberColumn represents the Text type column in your Big List, which used to store the list of numbers 00001 - 99999. The OriginalNumberColumn represents the column in your Original List to store the original number, e.g. 1000011, 1000045, 1005646, 1006565, ... etc.

Please take a try with above solution, then check if it help in your scenario.

Best regards,

Community Support Team _ Kris Dai
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

Announcements

Announcing | Super Users - 2023 Season 1

Super Users – 2023 Season 1    We are excited to kick off the Power Users Super User Program for 2023 - Season 1.  The Power Platform Super Users have done an amazing job in keeping the Power Platform communities helpful, accurate and responsive. We would like to send these amazing folks a big THANK YOU for their efforts.      Super User Season 1 | Contributions July 1, 2022 – December 31, 2022  Super User Season 2 | Contributions January 1, 2023 – June 30, 2023    Curious what a Super User is? Super Users are especially active community members who are eager to help others with their community questions. There are 2 Super User seasons in a year, and we monitor the community for new potential Super Users at the end of each season. Super Users are recognized in the community with both a rank name and icon next to their username, and a seasonal badge on their profile.    Power Apps  Power Automate  Power Virtual Agents  Power Pages  Pstork1*  Pstork1*  Pstork1*  OliverRodrigues  BCBuizer  Expiscornovus*  Expiscornovus*  ragavanrajan  AhmedSalih  grantjenkins  renatoromao    Mira_Ghaly*  Mira_Ghaly*      Sundeep_Malik*  Sundeep_Malik*      SudeepGhatakNZ*  SudeepGhatakNZ*      StretchFredrik*  StretchFredrik*      365-Assist*  365-Assist*      cha_cha  ekarim2020      timl  Hardesh15      iAm_ManCat  annajhaveri      SebS  Rhiassuring      LaurensM  abm      TheRobRush  Ankesh_49      WiZey  lbendlin      Nogueira1306  Kaif_Siddique      victorcp  RobElliott      dpoggemann  srduval      SBax  CFernandes      Roverandom  schwibach      Akser  CraigStewart      PowerRanger  MichaelAnnis      subsguts  David_MA      EricRegnier  edgonzales      zmansuri  GeorgiosG      ChrisPiasecki  ryule      AmDev  fchopo      phipps0218  tom_riha      theapurva  takolota     Akash17  momlo     BCLS776  Shuvam-rpa     rampprakash  ScottShearer     Rusk  ChristianAbata     cchannon  Koen5     a33ik   Heartholme     AaronKnox        Matren        Alex_10        Jeff_Thorpe        poweractivate        Ramole        DianaBirkelbach        DavidZoon        AJ_Z        PriyankaGeethik        BrianS        StalinPonnusamy        HamidBee        CNT        Anonymous_Hippo        Anchov        KeithAtherton        alaabitar        Tolu_Victor        KRider        sperry1625        IPC_ahaas      zuurg    rubin_boer   cwebb365   Dorrinda   G1124   Gabibalaban   Manan-Malhotra   jcfDaniel   WarrenBelz   Waegemma      If an * is at the end of a user's name this means they are a Multi Super User, in more than one community. Please note this is not the final list, as we are pending a few acceptances.  Once they are received the list will be updated.

Microsoft Power Platform Conference | Registration Open | Oct. 3-5 2023

We are so excited to see you for the Microsoft Power Platform Conference in Las Vegas October 3-5 2023! But first, let's take a look back at some fun moments and the best community in tech from MPPC 2022 in Orlando, Florida.   Featuring guest speakers such as Charles Lamanna, Heather Cook, Julie Strauss, Nirav Shah, Ryan Cunningham, Sangya Singh, Stephen Siciliano, Hugo Bernier and many more.   Register today: https://www.powerplatformconf.com/

Check out the new Power Platform Communities Front Door Experience!

We are excited to share the ‘Power Platform Communities Front Door’ experience with you!   Front Door brings together content from all the Power Platform communities into a single place for our community members, customers and low-code, no-code enthusiasts to learn, share and engage with peers, advocates, community program managers and our product team members. There are a host of features and new capabilities now available on Power Platform Communities Front Door to make content more discoverable for all power product community users which includes ForumsUser GroupsEventsCommunity highlightsCommunity by numbersLinks to all communities Users can see top discussions from across all the Power Platform communities and easily navigate to the latest or trending posts for further interaction. Additionally, they can filter to individual products as well.       Users can filter and browse the user group events from all power platform products with feature parity to existing community user group experience and added filtering capabilities.     Users can now explore user groups on the Power Platform Front Door landing page with capability to view all products in Power Platform.    Explore Power Platform Communities Front Door today. Visit Power Platform Community Front door to easily navigate to the different product communities, view a roll up of user groups, events and forums.