多维表格

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---
title: "Rollup"
description: "Understanding Rollup Column!"
position: 560
category: "Product"
menuTitle: "Rollup"
---
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## Rollup
Sample simple Organization structure:
- 5 Departments (company departments), each department has a team name & associated team code
- 5 employees working at different Departments
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- Vertical **has many** Employees : relationship has been defined
![LookUp](https://user-images.githubusercontent.com/86527202/144038845-402d5401-a214-4166-bc07-fcf8dcc8a961.png)
### RollUp AGGREGATION functions supported
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- Count
- Minimum
- Maximum
- Average
- Sum
- Count Distinct
- Sum Distinct
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- Average Distinct
Now, we can explore how to extract employee count information per vertical using **"ROLLUP"** columns
## Adding a rollup column
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### 1. Add new column
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Click on '+' icon to the left of column headers in Departments table
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![1](https://user-images.githubusercontent.com/86527202/144236273-484edc5b-7f5f-4041-b480-db08d4459d07.png)
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### 2. Feed column name
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![2](https://user-images.githubusercontent.com/86527202/144236279-41904955-4990-4a23-bec6-b0953002eac6.png)
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### 3. Select Column type as 'Rollup'
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![3](https://user-images.githubusercontent.com/86527202/144236283-4596e3e1-3bf8-488f-bc9b-8ec1466a35c6.png)
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### 4. Choose Child Table
Table Employee in our example
![4](https://user-images.githubusercontent.com/86527202/144236284-301178d8-f452-4d1e-9dff-80dd9570c280.png)
### 5. Choose on Child column
Pick appropriate column for aggreagation
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![5](https://user-images.githubusercontent.com/86527202/144236286-28547d74-feb8-4ad8-a872-7ba809e5db1e.png)
### 6. Select Aggregate function
Aggregate function will be "count" in our case
![6](https://user-images.githubusercontent.com/86527202/144236288-34a567d5-a5e9-4a1e-b074-5ea633e799a3.png)
### 7. Click on Save
![7](https://user-images.githubusercontent.com/86527202/144236289-5872529a-ba47-428d-979e-fdefb92a1039.png)
### 8. Column TeamCount is populated with appropriate information
![8](https://user-images.githubusercontent.com/86527202/144236291-52855f92-ad8b-4be1-aa98-b5cfdb1ee108.png)