Removing duplicates in Excel - Dashboard Guide

Dashboard Mode - Removing duplicates

Goal

Find unique customer names from a sales list to avoid counting duplicates.

Sample Data

Order ID	Customer Name	Product	Amount
1001	Alice	Apples	50
1002	Bob	Bananas	30
1003	Alice	Oranges	20
1004	David	Apples	40
1005	Bob	Grapes	25
1006	Eva	Bananas	35
1007	Frank	Oranges	45

Dashboard Components

• KPI Card: Total Orders
  Formula: =COUNTA(A2:A8)
  Result: 7
• KPI Card: Unique Customers
  Formula: =COUNTA(UNIQUE(B2:B8))
  Result: 5
• Table: Unique Customer List
  Formula in C11: =UNIQUE(B2:B8)
  Shows list of unique customer names: Alice, Bob, David, Eva, Frank

Dashboard Layout

+----------------+------------------+
| Total Orders   | Unique Customers  |
|     (KPI)     |      (KPI)        |
+----------------+------------------+
|       Unique Customer List       |
|            (Table)               |
+---------------------------------+

Interactivity

If you add a filter by product (e.g., show only orders with 'Apples'), the Total Orders and Unique Customers KPIs update to count only filtered rows. The Unique Customer List table also updates to show unique customers from filtered data.

Self Check

If you filter the data to show only orders where Product = 'Bananas', which components update and what are their new values?

• Total Orders: 2 (orders 1002 and 1006)
• Unique Customers: 2 (Bob and Eva)
• Unique Customer List: Bob, Eva

Key Result

Dashboard shows total orders, unique customers count, and a list of unique customer names from sales data.

Practice

1. What does the Remove Duplicates feature in Excel do?

easy

A. It deletes repeated entries and keeps only unique values.

B. It sorts the data alphabetically.

C. It highlights duplicate cells without removing them.

D. It copies data to another sheet.

Solution

1. Step 1: Understand the purpose of Remove Duplicates

   This feature is designed to clean data by deleting repeated entries.

2. Step 2: Identify what remains after using Remove Duplicates

   Only unique values remain in the list after duplicates are removed.

3. Final Answer:

   It deletes repeated entries and keeps only unique values. -> Option A

4. Quick Check:

   Remove Duplicates = Keeps unique values [OK]

Hint: Remove Duplicates deletes repeats, leaving unique values only [OK]

Common Mistakes:

• Thinking it only highlights duplicates
• Confusing it with sorting
• Assuming it copies data instead of removing duplicates

2. Which of these is the correct way to start removing duplicates in Excel?

easy

A. Go to the Data tab and click Remove Duplicates.

B. Go to the Home tab and click Sort.

C. Right-click a cell and select Insert Comment.

D. Use the Formulas tab and select Calculate Now.

Solution

1. Step 1: Locate the Remove Duplicates feature

   It is found under the Data tab in Excel's ribbon menu.

2. Step 2: Confirm the correct action to remove duplicates

   Clicking Remove Duplicates under Data tab starts the process.

3. Final Answer:

   Go to the Data tab and click Remove Duplicates. -> Option A

4. Quick Check:

   Remove Duplicates is under Data tab [OK]

Hint: Find Remove Duplicates under Data tab, not Home or Formulas [OK]

Common Mistakes:

• Looking under Home tab instead of Data
• Confusing Remove Duplicates with Sort
• Trying to remove duplicates via formulas tab

3. You have this list in column A:
Apple
Banana
Apple
Orange
Banana
After using Remove Duplicates on column A, what will the list look like?

medium

A. Apple, Banana, Apple, Orange, Banana

B. Apple, Banana, Orange

C. Orange, Banana, Apple

D. Apple, Orange

Solution

1. Step 1: Identify duplicates in the list

   The list has Apple twice and Banana twice.

2. Step 2: Remove repeated entries keeping only unique values

   After removal, only one Apple, one Banana, and one Orange remain.

3. Final Answer:

   Apple, Banana, Orange -> Option B

4. Quick Check:

   Duplicates removed = Apple, Banana, Orange [OK]

Hint: Remove duplicates keeps one of each unique item [OK]

Common Mistakes:

• Expecting duplicates to remain
• Thinking order changes randomly
• Removing unique items by mistake

4. You tried to remove duplicates from a table with columns Name and Email, but duplicates still appear. What is the likely mistake?

medium

A. You sorted the table instead of removing duplicates.

B. You used the Undo button after removing duplicates.

C. You only selected one column instead of both before removing duplicates.

D. You applied Remove Duplicates on a blank sheet.

Solution

1. Step 1: Understand how Remove Duplicates works with multiple columns

   It checks duplicates based on selected columns only.

2. Step 2: Identify the mistake of selecting only one column

   If only one column is selected, duplicates in other columns remain.

3. Final Answer:

   You only selected one column instead of both before removing duplicates. -> Option C

4. Quick Check:

   Select all relevant columns to remove duplicates correctly [OK]

Hint: Select all columns to check before removing duplicates [OK]

Common Mistakes:

• Selecting only one column in multi-column data
• Confusing sorting with removing duplicates
• Trying to remove duplicates on empty data

5. You have a table with columns: Product, Color, Price. You want to remove rows where both Product and Color are duplicates, but keep rows with same Product but different Color. How do you do this?

hard

A. Sort by Price and then remove duplicates.

B. Select all three columns in Remove Duplicates dialog and click OK.

C. Select only Product column in Remove Duplicates dialog and click OK.

D. Select only Product and Color columns in Remove Duplicates dialog and click OK.

Solution

1. Step 1: Identify which columns define duplicates

   Duplicates are rows where both Product and Color match.

2. Step 2: Select only Product and Color columns in Remove Duplicates

   This ensures rows with same Product but different Color stay.

3. Step 3: Confirm that Price is ignored in duplicate check

   Price differences won't affect duplicate removal.

4. Final Answer:

   Select only Product and Color columns in Remove Duplicates dialog and click OK. -> Option D

5. Quick Check:

   Choose columns defining duplicates to remove correctly [OK]

Hint: Select only columns that define duplicates before removing [OK]

Common Mistakes:

• Selecting all columns removes more rows than needed
• Selecting only Product removes rows with different colors
• Sorting does not remove duplicates