CREATE TABLE "references" (
  "grade" text,
  "description" text,
  "measurement" text,
  "function_pct" text,
  "estimated_function_pct" real
);

Question: What is the function percentage when the estimated function percentage is 20?
SQL: SELECT "function_pct" FROM "references" WHERE "estimated_function_pct"=20;

Question: What is the measurement where the estimated function % is less than 20?
SQL: SELECT "measurement" FROM "references" WHERE "estimated_function_pct"<20;

Question: What is the estimated function % when the measurement is 8/8?
SQL: SELECT "estimated_function_pct" FROM "references" WHERE "measurement"='8/8';