CREATE TABLE "specifications" (
  "parameter" text,
  "1st_stage" text,
  "2nd_stage" text,
  "3rd_stage" text,
  "4th_stage" text
);

Question: What is the Parameter that has the third phase of 0.50 m?
SQL: SELECT "parameter" FROM "specifications" WHERE "3rd_stage"='0.50 m';

Question: What is the second stage that has the third phase of 20kn?
SQL: SELECT "2nd_stage" FROM "specifications" WHERE "3rd_stage"='20kn';

Question: What is the third stage that has the first phase of 5,443kg?
SQL: SELECT "3rd_stage" FROM "specifications" WHERE "1st_stage"='5,443kg';

Question: What is the Parameter that has the third phase of 20kn?
SQL: SELECT "parameter" FROM "specifications" WHERE "3rd_stage"='20kn';