Challenge No. 75: Groups are separated by blank rows in Problem table.
Solved using: Python in Excel.
Table.AddIndexColumn
Adds an index column to a table in Power Query.
Custom Grouping! Part 9
Challenge No. 143: Groups the sales values every week starting from Friday days starting from 1/1/2024.
Solved using:Excel (GROUPBY, LAMBDA, LET), Google Sheets, Power Query (Table.Group, Date.WeekOfYear, Table.AddColumn), Python, Python in Excel, and R.
Add Index Column! Part 4
Challenge No. 127: Add an index column to the question table, with a separate counter for each stock.
Solved using:Excel (DROP, FILTER, HSTACK), Google Sheets, Power Query (Table.AddColumn, Table.AddIndexColumn), Python, Python in Excel, and R.
Fill Missing Store Dates
Challenge No. 50: If there is a discontinuity in dates for a Store, fill in the missing dates with details of previous records and also fill in the sequence of record numbers for a customer in that store.
Solved using: SQL.
Add Index Column! Part 3
Challenge No. 117: Add an Index column for the Question table with a separate counter for each stock.
Solved using:Excel (COUNTIF, HSTACK, IF), Google Sheets, Power Query (Table.AddIndexColumn, Table.Group, Table.Sort), Python, Python in Excel, and R.
Add Suffix to Duplicates
Challenge No. 134: If an animal appears more than once, then that animal’s name should be suffixed with 1, 2, 3.
Solved using: SQL.
Duplicate Values! Part 2
Challenge No. 113: Consider the IDs in the question table.
Solved using:Excel (DROP, IF, LAMBDA), Google Sheets, Power Query (List.Transform, Table.AddColumn, Table.AddIndexColumn), Python, Python in Excel, and R.
Custom Rank! Part 2
Challenge No. 112: In the question table, rank the products based on the difference between sales in 2023 and 2022, in descending order.
Solved using:Excel (HSTACK, LET, ROWS), Google Sheets, Power Query (Table.AddIndexColumn, Table.Sort), Python, Python in Excel, and R.
Compare Rows! Part 1
Challenge No. 102: In the historical sales table, identify and extract the dates where the sales value on that date is greater than the sales on the previous date.
Solved using:Excel (DROP, FILTER, IF), Google Sheets, Power Query (Table.AddColumn, Table.AddIndexColumn, Table.SelectColumns), Python, Python in Excel, R, and VBA.
Process Step Order Suffixing
Challenge No. 14: (Excel formulas also welcome)
A process gets executed in steps A through D in order (not all steps are necessary in the process but the order defines when the process has started and when it has ended.
Solved using: Power Query (Table.AddColumn, Table.AddIndexColumn).