Question: If the peak reached is 6 Cannot handle non-empty timestamp argument! 1992, what is the entered?
SQL: SELECT "Entered [A ]" FROM "1-26400041-2" 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 "1-26400041-2" WHERE "Peak" = 9.0;

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 "1-26400041-2" WHERE "Entered [A ]" = '7 Cannot handle non-empty timestamp argument! 1992' AND "Weeks in top 10" = 4.0;