CREATE TABLE "singles_6_2_4" (
  "outcome" text,
  "year" real,
  "championship" text,
  "surface" text,
  "opponent" text,
  "score" text
);

Question: What was the outcome before 1997?
SQL: SELECT "outcome" FROM "singles_6_2_4" WHERE "year"<1997;

Question: What championship after 1997 was the score 1–6, 4–6, 7–5, 5–7?
SQL: SELECT "championship" FROM "singles_6_2_4" WHERE "year">1997 AND "score"='1–6, 4–6, 7–5, 5–7';

Question: How many years was the opponent petr korda?
SQL: SELECT COUNT("year") FROM "singles_6_2_4" WHERE "opponent"='petr korda';

Question: What was the surface in 1996?
SQL: SELECT "surface" FROM "singles_6_2_4" WHERE "year"=1996;