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[Music] thank you hi everyone my name is Melissa and in this video I want to go over my approach to the conditional index challenge by bahati Gupta the task is to add an index number that restarts for each ID and begins in the row after the values in the date column hits 90 or greater than 90. if you havent participated yet and want to give this a go yourself I highly recommend it its loads of fun youll find the link in the description of this video alright lets go to the power query editor Im going to start with a group Buy on the ID column because that will return the table with unique ID values now there are three places where you can find Groupon so its in the transform section on the Home tab on the transform tab its in the table section right here but you can also right click the column header and find Group by there so it opens this dialog and you can do all kinds of aggregations here but I only want to segment my data therefore Ill choose the operation all rows and Il