    # File lib/active_record/connection_adapters/sqlserver_adapter.rb, line 485
          def remove_check_constraints(table_name, column_name)
            # TODO remove all constraints in single method
            constraints = select "SELECT CONSTRAINT_NAME FROM INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE where TABLE_NAME = '#{table_name}' and COLUMN_NAME = '#{column_name}'"
            constraints.each do |constraint|
              execute "ALTER TABLE #{table_name} DROP CONSTRAINT #{constraint["CONSTRAINT_NAME"]}"
            end
          end