For grants with both documents described as 'Regular' and documents described as 'Initial Application', list its start date.
create table grants (grant_start_date varchar, grant_id varchar, PRIMARY KEY (grant_start_date)); create table document_types (document_type_code varchar, document_description varchar, PRIMARY KEY (document_type_code)); create table documents (grant_id varchar, document_type_code varchar, PRIMARY KEY (grant_id))
select t1.grant_start_date from grants as t1 join documents as t2 on t1.grant_id = t2.grant_id join document_types as t3 on t2.document_type_code = t3.document_type_code where t3.document_description = 'regular' intersect select t1.grant_start_date from grants as t1 join documents as t2 on t1.grant_id = t2.grant_id join document_types as t3 on t2.document_type_code = t3.document_type_code where t3.document_description = 'initial application'