Excel BI - Excel Challenge 795

excel-challenges

excel-formulas

🔰 Summarize the table as shown.

Published

March 24, 2026

Illustration for Excel BI - Excel Challenge 795

Challenge Description

🔰 Summarize the table as shown.

Solutions

library(tidyverse)
library(readxl)

path = "Excel/700-799/795/795 Summarize.xlsx"
input = read_excel(path, range = "A2:C10")
test  = read_excel(path, range = "E2:G6")

result = input %>%
  fill(Supplier) %>%
  summarise(Items = paste0(Items, collapse = " - "),
            Cost = paste0(Cost, collapse = " - "),
            .by = Supplier)

all.equal(result, test)
# > [1] TRUE

Logic: Read the workbook ranges needed for the challenge; Aggregate or rank the data at the required grouping level.
Strengths: The code maps the workbook rule into a compact, reproducible pipeline.
Areas for Improvement: The solution assumes the workbook layout and selected ranges remain stable, so any structural change in the sheet would require small adjustments.
Gem: The elegant part is how little code is needed once the correct intermediate representation is chosen.

import pandas as pd

path = "700-799/795/795 Summarize.xlsx"
input = pd.read_excel(path, usecols="A:C", skiprows=1, nrows=8, dtype=str)
test = pd.read_excel(path, usecols="E:G", skiprows=1, nrows=4, dtype=str).rename(columns=lambda col: col.replace('.1', ''))

result = input.ffill().groupby('Supplier', as_index=False).agg({'Items': ' - '.join, 'Cost': ' - '.join})

print(result.equals(test)) # True

The Python version follows the same grouped logic and keeps the transformation explicit in a dataframe pipeline.

Difficulty Level

Easy / Medium

The business rule is clear, though the workbook still needs a few transformation steps to reach the expected output.