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## Description
Pivot tables are cool.
## Code
```ruby
require 'axlsx'
p = Axlsx::Package.new
wb = p.workbook
wb.add_worksheet(name: 'Basic Worksheet') do |sheet|
sheet.add_row ['Month', 'Year', 'Type', 'Sales', 'Region']
# Generate some data
30.times do
sheet.add_row [
['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'].sample,
[2010, 2011, 2012].sample,
['Meat', 'Dairy', 'Beverages', 'Produce'].sample,
rand(5000),
['East', 'West', 'North', 'South'].sample
]
end
sheet.add_pivot_table 'G4:L17', 'A1:E31', sort_on_headers: ['Year', 'Month'] do |pivot_table|
pivot_table.rows = ['Year', 'Month']
pivot_table.columns = ['Type']
pivot_table.data = [ref: 'Sales', num_fmt: 4]
pivot_table.pages = ['Region']
end
end
p.serialize 'pivot_table_example.xlsx'
```
## Output
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