Investment income of 2%, and an other income sources of 3%, and an employment (salaries & wages) of 71% involves which self employed?
CREATE TABLE "sources_of_income" (
  "region" text,
  "employment_salaries_wages" text,
  "self_employed" text,
  "investment_income" text,
  "working_tax_credit" text,
  "state_pensions" text,
  "occupational_pensions" text,
  "disability_benefits" text,
  "other_social_security_benefits" text,
  "other_income_sources" text
);
SELECT "self_employed" FROM "sources_of_income" WHERE "investment_income"='2%' AND "other_income_sources"='3%' AND "employment_salaries_wages"='71%';