Creating collection from multiple tables

[Anonymous]

Hello, is it possible to create a collection based on different tables that are not related?

For example:

Table1 -> Names: "Person1", "Person2", "Person3"

Table2 -> Ages: "Age1", "Age2", "Age3"

And I want my collection to have a column for Table1 (Names) and a column for Table2 (Ages)

Names    |  Ages

_________________

Person1  |  Age1

Person2  |  Age2

Person2  |  Age3

The tables are not related, I just want to join them based on their position (the first name with the first age, second name with second age...)

Any ideas?

I can't seem to figure it out

[Pstork1]

Not really possible without some kind of Field in common to relate one to the next.

[RezaDorrani]

@Anonymous 

Possible but with lots of work to link the 2 collections

Firstly you will need to ensure you have an index column on both the lists

Check below post on how to create index (look at the last response from MSFT)

https://powerusers.microsoft.com/t5/Building-PowerApps-Formerly/Patching-an-item-index-number-into-a-collection/td-p/339716

Next what you would need to do is the following:

ForAll(CollectionTable, Collect(CollectionJoin,{Tables:CollectionTable[@Tables],Ages: Lookup(CollectionAges, Index = CollectionTable[@Index].Ages}))

where CollectionTable is name of you table colection with Index column

CollectionJoin is name of new collection

CollectionAges is name of collection with Ages and Index column

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[mdevaney · Accepted solution]

@Anonymous 

PowerApps does not have the ability to join tables on based on the position.  I believe the technical term for your concept is a "Cartesian Join" and the resulting table is called a "Cartesian Product".  That's what I remember from learning SQL.

The only way to make your join is to edit the data and assign row numbers like so.

ClearCollect(
    NamesTable,
    {row: 1, name: "Person1"},
    {row: 2, name: "Person2",
    {row: 3, name: "Person3"}
);

ClearCollect(
    AgesTable,
    {row: 1, age: "Age1"},
    {row: 2, age: "Age2",
    {row: 3, age: "Age3"}
);

Then you would join the columns in another Collection like this

ClearCollect(
    myJoinedTables,
    ShowColumns(
         AddColumns(NamesTable,"Age",LookUp(AgesTable,ID=NamesTable[@ID])),
         "Name","Age"
)       

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