It would be a cool feature if sequel could support CREATE INDEX INCLUDE option for MS SQL. Here is link with more details http://msdn.microsoft.com/en-us/library/ms188783.aspx

I have created local extension for my project. Attached mssql_extension.rb has the code. Sample usage in migration is below...

require '../lib/mssql_extension.rb'

Sequel.migration do

up do alter_table :foo do add_index [:col1], :include => [:col2,:col3,:col4] end end

down do alter_table :foo do drop_index [:col1] end end

end

This is a feature request and not a bug fix (this is a bug tracker, not a feature request tracker). Please submit a pull request with specs on github, and I'll merge it.