Data Science & Machine Learning

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✅ Tableau Calculated Fields

What are Calculated Fields?

Custom formulas you create in Tableau to do calculations beyond default aggregations. Think: Excel formulas inside Tableau.

Why use them?

1. Create new metrics like Profit Margin, YoY Growth

2. Categorize data: High/Medium/Low sales

3. Date math: Days between orders, fiscal periods

4. Conditional logic: IF/THEN/ELSE rules

Basic Syntax

IF [Sales] > 10000 THEN "High" ELSE "Low" END

[Profit] / [Sales] → Profit Ratio

DATEDIFF('day', [Order Date], [Ship Date])

Key Functions

Logical: IF, IIF, CASE

Math: ROUND, ABS, SQRT

Date: YEAR, MONTH, DATEDIFF

String: LEFT, RIGHT, CONTAINS

Pro Tips

1. Calculated fields compute row-level or aggregate depending on formula

2. Use ATTR() to avoid aggregation errors

3. Name fields clearly: Profit Margin % not Calc1

4. Test with a few rows before using in dashboards

👉 Tableau Resources: https://whatsapp.com/channel/0029VasYW1V5kg6z4EHOHG1t

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✅ Tableau Basics 📊🚀

👉 Tableau is one of the most popular Data Visualization and Business Intelligence (BI) tools.

It helps transform raw data into:

✔ Interactive dashboards

✔ Visual reports

✔ Business insights

🔹 1. What is Tableau?

Tableau is a drag-and-drop data visualization tool used by:

✔ Data Analysts

✔ Business Analysts

✔ Data Scientists

✔ Managers & Executives

👉 It allows users to analyze data without extensive coding.

🔥 2. Why Tableau is Popular?

✔ Easy to learn

✔ Interactive dashboards

✔ Fast visualization creation

✔ Connects to multiple data sources

🔹 3. Tableau Products

✅ Tableau Desktop: Used to create visualizations and dashboards.

✅ Tableau Server: Used to publish and share dashboards.

✅ Tableau Public: Free version for learning and sharing public dashboards.

🔹 4. Connecting Data Sources ⭐

Tableau can connect to:

✔ Excel files

✔ CSV files

✔ SQL Databases

✔ Cloud platforms

✔ APIs

🔹 5. Tableau Interface

Main areas:

✅ Data Pane: Contains fields and tables.

✅ Shelves: Used to build charts.

✅ Marks Card: Controls color, size, labels, and details.

✅ Worksheet: Area where visualizations are created.

🔥 6. Dimensions vs Measures ⭐

Dimensions: Categorical data.

Examples: ✔ Region, ✔ Product, ✔ Customer Name

Measures: Numerical data.

Examples: ✔ Sales, ✔ Profit, ✔ Quantity

🔹 7. Common Charts in Tableau

✔ Bar Chart

✔ Line Chart

✔ Pie Chart

✔ Map

✔ Scatter Plot

✔ Heat Map

🔹 8. Filters in Tableau

Filters help users focus on specific data.

Example:

✔ View sales for only one region,

✔ Show data for a selected year

🔹 9. Dashboards in Tableau ⭐

A dashboard combines multiple charts into one screen.

Example:

📊 Sales Trend,

📈 Profit Analysis,

🌍 Regional Performance

🔹 10. Why Tableau is Important?

✔ Highly demanded skill

✔ Common in analytics jobs

✔ Great for storytelling with data

✔ Frequently asked in interviews

🎯 Today's Goal

✔ Understand Tableau basics

✔ Learn dimensions & measures

✔ Understand dashboards

✔ Learn Tableau workflow

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