CREATE TABLE organizations (uk_vat_number NUMBER)
CREATE TABLE individuals (individual_last_name VARCHAR2, individual_id VARCHAR2)
CREATE TABLE organization_contact_individuals (organization_id VARCHAR2, individual_id VARCHAR2, date_contact_to VARCHAR2)

Find the last name of the first ever contact person of the organization with the highest UK Vat number.
SELECT t3.individual_last_name FROM organizations AS t1 JOIN organization_contact_individuals AS t2 ON t1.organization_id = t2.organization_id JOIN individuals AS t3 ON t2.individual_id = t3.individual_id WHERE t1.uk_vat_number = (SELECT MAX(uk_vat_number) FROM organizations) ORDER BY t2.date_contact_to LIMIT 1
SELECT "t3"."individual_last_name" FROM "organizations" "t1" JOIN "organization_contact_individuals" "t2" ON "t1"."organization_id" = "t2"."organization_id" JOIN "individuals" "t3" ON "t2"."individual_id" = "t3"."individual_id" WHERE "t1"."uk_vat_number" = (SELECT MAX("uk_vat_number") FROM "organizations") ORDER BY "t2"."date_contact_to" FETCH FIRST 1 ROWS ONLY