Challenges about data cleaning techniques.
Challenge No. 192: Any row with a negative quantity should reduce the corresponding value in the previous rows for the related product.
Solved using:Excel (DROP, FILTER, LAMBDA), Google Sheets, Power Query (Table.Group, Table.SelectRows, Table.Sort), Python, Python in Excel, and R.
Challenge No. 181: Transform the question structure into the result structure.
Solved using:Excel (DROP, FILTER, HSTACK), Google Sheets, Power Query (List.Alternate, List.Transform, Table.Group), Python in Excel, and R.
Challenge No. 177: Transform the question structure into the result structure.
Solved using:Excel (DROP, FILTER, HSTACK), Google Sheets, Power Query (Table.AddColumn, Table.ExpandTableColumn, Table.Group), Python, Python in Excel, and R.
Challenge No. 174: In the question table, filter out rows where there is a greater value within the two days before or after the current row.
Solved using:Excel (AND, FILTER, IF), Google Sheets, Power Query (Table.SelectRows), Python, Python in Excel, and R.
Challenge No. 171: Transform the question structure into the result structure.
Solved using:Excel (DROP, FILTER, HSTACK), Google Sheets, Power Query (List.Transform), Python, Python in Excel, and R.
Challenge No. 167: Transform the question structure into the result structure.
Solved using:Excel (FILTER, HSTACK, IF), Google Sheets, Power Query (List.Skip, List.Split, Table.AddColumn), Python, Python in Excel, and R.
Challenge No. 157: Transform the question structure into the result structure.
Solved using:Excel (HSTACK, INDEX, LAMBDA), Google Sheets, Power Query (List.Split, List.Transform, Text.Split), Python, Python in Excel, and R.
Challenge No. 155: Transform the question table into the result table format.
Solved using:Excel (DROP, FILTER, HSTACK), Google Sheets, Power Query (List.Skip, List.Transform, Table.AddColumn), Python, Python in Excel, and R.
Challenge No. 147: Transform the question structure into the result structure.
Solved using:Excel (FILTER, HSTACK, IF), Google Sheets, Power Query (List.Skip, List.Split, Table.AddColumn), Python, Python in Excel, R, and VBA.
Challenge No. 142: The Question table contains information about the fingerprinting times for various personnel when entering the company.
Solved using:Excel (DROP, HSTACK, IF), Google Sheets, Power Query (Table.AddColumn, Table.Group, Table.Pivot), Python, Python in Excel, and R.
