What's the snatch when the 139kg was 305kg and the Olympic Record was the world record?
CREATE TABLE "records" (
  "world_record" text,
  "snatch" text,
  "mu_shuangshuang_chn" text,
  "139kg" text,
  "doha_qatar" text
);
SELECT "snatch" FROM "records" WHERE "world_record"='olympic record' AND "139kg"='305kg';