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adding links to portfolio, adding portfolio docs
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‎assets/docs/CafeSales_DataCleaning.sql‎

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/* Adding fields: item_cleaned, quantity_cleaned, price_cleaned,
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totalspent_cleaned, paymentmethod_cleaned, location_cleaned, transactiondate_cleaned. */
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ALTER TABLE public."Cafe_Sales"
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ADD COLUMN "Item_Cleaned" TEXT,
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ADD COLUMN "Quantity_Cleaned" NUMERIC,
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ADD COLUMN "PricePerUnit_Cleaned" NUMERIC,
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ADD COLUMN "TotalSpent_Cleaned" NUMERIC,
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ADD COLUMN "PaymentMethod_Cleaned" TEXT,
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ADD COLUMN "Location_Cleaned" TEXT,
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ADD COLUMN "TransactionDate_Cleaned" DATE;
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ADD COLUMN "Day" TEXT,
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ADD COLUMN "Month" TEXT;
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-- Use CAST to convert and clean the numeric columns, replace ERROR and UNKNOWN values.
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UPDATE public."Cafe_Sales"
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SET
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"Item_Cleaned" =
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CASE
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WHEN "Item" IN ('ERROR', 'UNKNOWN') THEN NULL
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ELSE "Item"
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END,
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"Quantity_Cleaned" =
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CASE
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WHEN "Quantity" IN ('ERROR', 'UNKNOWN') THEN NULL
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ELSE CAST("Quantity" AS NUMERIC)
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END,
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"PricePerUnit_Cleaned" =
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CASE
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WHEN "Price Per Unit" IN ('ERROR', 'UNKNOWN') THEN NULL
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ELSE CAST("Price Per Unit" AS NUMERIC)
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END,
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"TotalSpent_Cleaned" =
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CASE
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WHEN "Total Spent" IN ('ERROR', 'UNKNOWN') THEN NULL
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ELSE CAST("Total Spent" AS NUMERIC)
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END,
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"PaymentMethod_Cleaned" =
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CASE
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WHEN "Payment Method" IN ('ERROR', 'UNKNOWN') THEN NULL
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ELSE CAST("Payment Method" AS NUMERIC)
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END,
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"Location_Cleaned" =
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CASE
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WHEN "Location" IN ('ERROR', 'UNKNOWN') THEN NULL
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ELSE "Location"
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END,
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"TransactionDate_Cleaned" =
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CASE
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WHEN "Transaction Date" IN ('ERROR', 'UNKNOWN') THEN NULL
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ELSE CAST("Transaction Date" AS NUMERIC)
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END;
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-- Subquery to create a table with items / pries. Join that back with all rows.
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UPDATE public."Cafe_Sales" AS cs
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SET "PricePerUnit_Cleaned" = prices."PricePerUnit_Cleaned"
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FROM (
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SELECT DISTINCT "Item_Cleaned", "PricePerUnit_Cleaned"
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FROM public."Cafe_Sales"
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WHERE "Item_Cleaned" IS NOT NULL
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AND "PricePerUnit_Cleaned" IS NOT NULL
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) AS prices
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WHERE cs."Item_Cleaned" = prices."Item_Cleaned"
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AND cs."PricePerUnit_Cleaned" IS NULL;
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-- Calculate the PricePerUnit_Cleaned for missing values.
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UPDATE public."Cafe_Sales"
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SET "PricePerUnit_Cleaned" = ROUND("TotalSpent_Cleaned" / "Quantity_Cleaned", 1)
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WHERE "PricePerUnit_Cleaned" IS NULL;
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-- Make sure data type is NUMERIC and that decimal is correct.
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ALTER TABLE public."Cafe_Sales"
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ALTER COLUMN "PricePerUnit_Cleaned" TYPE NUMERIC(10,1)
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USING ROUND("PricePerUnit_Cleaned", 1);
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-- Calculate any missing Quantities.
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UPDATE public."Cafe_Sales"
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SET "Quantity_Cleaned" = ("TotalSpent_Cleaned" / "PricePerUnit_Cleaned")
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WHERE "Quantity_Cleaned" IS NULL;
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-- Calculate any missing Total Spent values.
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UPDATE public."Cafe_Sales"
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SET "TotalSpent_Cleaned" = ("Quantity_Cleaned" * "PricePerUnit_Cleaned")
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WHERE "TotalSpent_Cleaned" IS NULL;
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-- Extract day and month values from TransactionDate.
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UPDATE public."Cafe_Sales"
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SET
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"Day" = TRIM(TO_CHAR("TransactionDate_Cleaned", 'Day')),
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"Month" = TRIM(TO_CHAR("TransactionDate_Cleaned", 'Month'));
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-- Fill in missing Items by using the PricePerUnit as a guide.
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UPDATE public."Cafe_Sales"
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SET "Item_Cleaned" =
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CASE
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WHEN "PricePerUnit_Cleaned" = 1 THEN 'Cookie'
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WHEN "PricePerUnit_Cleaned" = 1.5 THEN 'Tea'
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WHEN "PricePerUnit_Cleaned" = 2 THEN 'Coffee'
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WHEN "PricePerUnit_Cleaned" = 5 THEN 'Salad'
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ELSE "Item_Cleaned"
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END
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WHERE "Item_Cleaned" IS NULL;
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-- OPTIONAL: Select the rows without NULL values.
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SELECT "Transaction ID", "Item_Cleaned", "Quantity_Cleaned", "PricePerUnit_Cleaned",
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"TotalSpent_Cleaned", "PaymentMethod_Cleaned", "Location_Cleaned", "TransactionDate_Cleaned",
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"Day", "Month"
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FROM public."Cafe_Sales"
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WHERE "Item_Cleaned" IS NOT NULL AND
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"Quantity_Cleaned" IS NOT NULL AND
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"PricePerUnit_Complete" IS NOT NULL AND
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"TotalSpent_Cleaned" IS NOT NULL
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ORDER BY "Transaction ID" ASC;

‎assets/docs/FurnitureSales_Dashboard.xlsx‎

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‎assets/docs/LisbonAirbnbListings_FINAL.twbx‎

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‎portfolio.md‎

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<br>
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#### Furniture Store Sales - Excel Dashboard
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<a href="/assets/docs/FurnitureSales_Dashboard.xlsx">
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#### Furniture Store Sales - Excel Dashboard
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</a>
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An interactive Excel dashboard that provides insights into sales trends, customer behavior, and product performance. Ideal for store managers, sales teams, and analysts looking to monitor and understand business performance at a glance.
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![Furniture Store Sales - Excel Dashboard]({{site.baseurl}}/assets/images/sample_portfolio/excel.jpg)
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<a href="/assets/docs/FurnitureSales_Dashboard.xlsx">
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![Furniture Store Sales - Excel Dashboard]({{site.baseurl}}/assets/images/sample_portfolio/excel.jpg)
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</a>
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<br><br><br><br>
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#### Airbnb Listings in Lisbon - Tableau Dashboard

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