csvrecord | csvrecord library / gem - read in comma-separated values | SQL Database library

I have a csv file. It contains several duplicate columns. I am trying to remove these duplicates using Java. I found Apache Common csv library, some people use it to remove duplicate rows. How can I use it to remove or skip duplicate columns?

For example: my csv header is:

I want to allow users to upload a CSV file. I have my file input nested in the parent. I can console log the uploaded CSV file in the child component and see I have it fine but I receive undefined when I pass it through to the parent.

I guess I am not passing the correct value in the parent but I'm not sure what it should be.

child.component.html

Am trying to convert a 2D slice of string into 1d slice of bytes but it is very slow. Any better way to do ?,

If there is a comma in the field, but the whole is closed with quotation marks, then I should not treat it as a column divider. How can this be done?

Example aaaa, "bb,bb", cccc and I get aaaa | bb | bb |ccc

How can I receive aaaa | "bb,bb" | cccc ?

Looking to get some help with my powershell script. Basically have a script that I use to bulk edit fields in Azure AD for multiple users and it works fine. I tried to use it for editing custom attributes for multiple users via Exchange Online and it is not working. I'm guessing it does not work the same for EO. The goal here is to pull a csv that has 2 columns (the users emails address "userprincipalname", and one column for the value I want to add for "customattribute1") Any help is appreciated.

I'm currently trying to extract headers only in Strings. The below is the method and I'm trying to get the headers from

https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_time_series/time_series_covid19_confirmed_global.csv

not the data of the headers. I'm using Commons-csv library . I tried some codes that I found in stackoverflow but it prints the values of the header not the header itself.

how should I change my code to extract headers only with List of Strings

I am making a Rest API with Spring Boot. I have a method like this in my controller:

I have a method that checks the data changes every 10 seconds and I want after checking if data has changed just to update previous data, not insert a new record in the database. I mean with this code every 10 seconds new record will be inserted into the database and finally, my API look like this:

I am trying to save multiple CSV files into different MongoDB collections in JSON format using node.js express and mongoose, and then compare these files, currently, I managed to upload the CSV files to the MongoDB database but as documents, so every time I upload a new one it just gets added along with the other documents. which will make comparing the CSV files impossible cause you can't tell which documents will belong to what file.

A solution that seemed logical to me was to upload the CSV files as separate Collections and then compare the collections is this the best possible solution if so how could I implement that.

The mongoose model used :