CREATE TABLE "acute_toxicity" (
  "method_of_administration_citation_needed" text,
  "category_1" real,
  "category_2" real,
  "category_3" text,
  "category_4" text,
  "category_5" text
);

Question: What's the sum of all values in category 1 when category 3 is equal to 300?
SQL: SELECT SUM("category_1") FROM "acute_toxicity" WHERE "category_3"='300';

Question: If category 1 is 0.05, what is category 3?
SQL: SELECT "category_3" FROM "acute_toxicity" WHERE "category_1"=0.05;