Query the left join of the insurance_application table with the insurance_policy table, using the application number as the foreign key. Retrieve the application numbers from the insurance_application table where there is missing data in the insurance_policy table. The schema information for the insurance_policy table is as follows: insurance_policy (policy_number, application_number, applicant_id, applicant_name, insured_id, insured_name, total_premium, premium_incl_tax, premium_excl_tax, issuance_date, policy_start_date, policy_end_date, policy_status, transaction_number, additional_fields). The schema information for the insurance_application table is as follows: insurance_application (application_number, applicant_id, applicant_name, total_premium, premium_incl_tax, premium_excl_tax, issuance_date, policy_start_date, policy_end_date, insured_id, insured_name, additional_info, underwriting_approved). Your answer should have exactly 4 paragraphs. Make sure that the first paragraph starts with the word "identity" and that each paragraph is separated by two new lines.
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