CREATE TABLE "table1_26400041_2" (
  "entered_a" text,
  "weeks_in_top_10" real,
  "single" text,
  "artist" text,
  "peak" real,
  "peak_reached_a" text,
  "weeks_at_peak" real
);

Question: If the peak reached is 6 cannot handle non-empty timestamp argument! 1992, what is the entered?
SQL: SELECT "entered_a" FROM "table1_26400041_2" WHERE "peak_reached_a"='6 Cannot handle non-empty timestamp argument! 1992';

Question: if the peak is 9, how many weeks was it in the top 10?
SQL: SELECT MAX("weeks_in_top_10") FROM "table1_26400041_2" WHERE "peak"=9;

Question: What was the peak reached for a single with 4 weeks in the top 10 and entered in 7 cannot handle non-empty timestamp argument! 1992?
SQL: SELECT "peak_reached_a" FROM "table1_26400041_2" WHERE "entered_a"='7 Cannot handle non-empty timestamp argument! 1992' AND "weeks_in_top_10"=4;