select count(variable_name) as n_variables from survey_variables, survey_variables_surveys_map where survey_variables.variable_id = survey_variables_surveys_map.variable_id and section_id = :section_id select variable_name, survey_variables.variable_id as variable_id from survey_variables, survey_variables_surveys_map where survey_variables.variable_id = survey_variables_surveys_map.variable_id and section_id = :section_id order by survey_variables.variable_id