CREATE TABLE "sigma_levels" (
  "sigma_level" real,
  "sigma_with_1_5_shift" text,
  "dpmo" text,
  "percent_defective" text,
  "percentage_yield" text,
  "short_term_c_pk" text,
  "long_term_c_pk" text
);

Question: What is the percentage yield for a DPMO of 3.4?
SQL: SELECT "percentage_yield" FROM "sigma_levels" WHERE "dpmo"='3.4';

Question: How many percentage yield figures are there when 6.7% are defective?
SQL: SELECT COUNT("percentage_yield") FROM "sigma_levels" WHERE "percent_defective"='6.7%';

Question: What is long-term C PK when the short-term C PK is 2.00?
SQL: SELECT "long_term_c_pk" FROM "sigma_levels" WHERE "short_term_c_pk"='2.00';

Question: What is the sigma (with 1.5σ shift) when there are 69% defective?
SQL: SELECT "sigma_with_1_5_shift" FROM "sigma_levels" WHERE "percent_defective"='69%';

Question: When sigma (with 1.5σ shift) is 2.5, what percent is defective?
SQL: SELECT "percent_defective" FROM "sigma_levels" WHERE "sigma_with_1_5_shift"='2.5';