CREATE TABLE "ch_or_12th_emergency_flotilla" (
  "name" text,
  "pennant" text,
  "builder" text,
  "laid_down" text,
  "launched" text,
  "commissioned" text,
  "fate" text
);

Question: What are the commissioned for scotts, greenock and chieftain?
SQL: SELECT "commissioned" FROM "ch_or_12th_emergency_flotilla" WHERE "builder"='Scotts, Greenock' AND "name"='Chieftain';

Question: What is the builder launched 30 october 1944?
SQL: SELECT "builder" FROM "ch_or_12th_emergency_flotilla" WHERE "launched"='30 October 1944';