Google Sheets Indexing and Matching issue - google-sheets

Question

CleanedData tab RawData tab I am tracking clients in google sheets with 2 different tabs, RawData and CleanedData.
Both tabs have 11 different columns, one being a "purchase date" column
The RawData tab keeps track of all clients that have signed up for info sessions regardless if they made a purchase or not, so every time a client has made a purchase it populates another row with the date of purchase.
In the cleaneddata tab I want to clean all the data from the RawData tab into one row for each client, for example if client "X" has 5 rows of data in the RawData tab but only one of those rows has his purchase date, I then want to pull that row with the purchase date into the cleaneddata tab.
The issue I'm having is that the purchase date is not copying over to the cleaneddata tab and I believe it is because it's accounting for the duplicate data rows that are in the RawData tab, that I need to be there.
The equation I'm using in the purchase date cell of the cleaneddata tab is:
=index(RawData!$A$1:$L, match(1,($A428=RawData!$A$1:$A)*($L428=RawData!$L$1:$L),0),match(J$1,RawData!$A$1:$L$1,0))
Is there anyway to rework this equation to account for the duplicates in the RawData tab so that the purchase data will copy over?
Any help is greatly appreciated,
Thank you
Edit: I can not share the sheet file for security purposes but I uploaded a picture of what the RawData and CleanedData tabs look like, I need some equation or method to pull the purchase date from the RawData tab to the cleaneddata tab that also accounts for the repeated rows in the RawData tab

Answer 1

If you just need to get a subset of rows that match a specific criteria (such as given column in the row containing a value) you can use the =FILTER or =QUERY functions.
eg.
=FILTER(RawData!A:L, RawData!J:J <> "")
or
=QUERY(RawData!A:L, "SELECT * WHERE J IS NOT NULL")
Translated into plain English, both of these effectively say, "Get every row in the range RawData!A:L where column RawData!J:J isn't empty.
FILTER is fast and powerful.
QUERY gives you even more control but is more complex to use. You can run some operations on specific columns or change the data format. eg. If you'd like to change the format of the dates in column J from US-format to ISO-format, you could use:
=QUERY(RawData!A:L, "SELECT * WHERE J IS NOT NULL FORMAT J 'YYYY-MM-DD'")
See https://developers.google.com/chart/interactive/docs/querylanguage for the QUERY docs.