# Claude — Excel, raw output

- Date: 2026-09-17, sent 09:16 (+07), answered in ~3 min. Sonnet 5, Medium effort (the free plan's default; run from a paid account in an incognito chat - not saved, no memory). File attached through the composer's own upload; brief pasted.
- Capture: page text via JS, plus the in-page spreadsheet preview. Ran code twice ("Ran 5 commands, read a file", "Ran 8 commands, edited a file, shared files"); one visible thought about date ambiguity ("All DD/MM/YYYY format (day-first, consistent with Portugal)"). Returned "Orders q2 cleaned.xlsx" with three sheets: Orders (cleaned), Summary (live formulas), Data Issues.
- First read: all eight fault classes named. Category totals, top product, the four duplicates and the five mismatches all exact. Filled missing Region with "Unknown" rather than leaving it blank. Formula uses a fixed 10,000-row range (`Orders!$B$2:$B$10000`) rather than whole columns or a Table, and says so.

## Answer

What was wrong:

- Dates in 3 formats mixed (Excel dates, DD/MM/YYYY, Mon D, YYYY)
- Unit Price sometimes text like €21,00 instead of a number
- Product names inconsistent case/spacing (SARDINES TIN X3, Ginjinha 200ml, Vinho Verde 750 ml)
- 8 missing Category and 2 missing Region values
- 3 missing Qty values
- 4 exact duplicate order rows
- 5 orders where Total ≠ Qty × Unit Price

Fixes applied: parsed dates/prices, standardized product names, filled missing Category (from product), filled missing Qty (from Total÷Price), filled missing Region as "Unknown", recalculated all Totals, dropped duplicates. Output has 3 sheets: Orders (cleaned), Summary (live formulas), Data Issues (removed duplicates + original mismatches).

Revenue & units (Apr–Jun 2026):

[bar chart "Revenue per Month (€)" for Apr, May, Jun 2026 - values in the Summary sheet, see the file check in the sheet]

Category revenue: Home €1,399.00, Pantry €1,109.70, Drinks €886.80 — total €3,395.50.
Best-selling product: Vinho Verde 750ml, 42 units.

Duplicate orders removed (identical rows, kept first): PT-1027 (Guilherme Pinto), PT-1085 (Filipe Sousa), PT-1075 (Lara Mendes), PT-1120 (Nuno Lopes) — full list in the "Data Issues" sheet.

Total ≠ Qty × Price (5 orders, from original data — fixed in the cleaned sheet): PT-1028, PT-1037, PT-1101, PT-1010, PT-1039 — details in "Data Issues" sheet.

Formula for revenue per month (paste in a helper cell, keeps working as you add rows — assumes Date in column B, Total in column H):

    =SUMPRODUCT((TEXT(Orders!$B$2:$B$10000,"YYYY-MM")="2026-04")*Orders!$H$2:$H$10000)

Change "2026-04" to the month you want. Using a large fixed range like $2:$10000 instead of exact row counts means new rows you add stay inside it automatically.

[Attachment: Orders q2 cleaned · XLSX · Download]