CREATE TABLE table_55920 ("Season" CLOB, "Club" CLOB, "National League" CLOB, "National Cup" CLOB, "European Cup" CLOB)

Which European Cup is in the 2006-07 season?
SELECT "European Cup" FROM table_55920 WHERE "Season" = '2006-07'
SELECT "European Cup" FROM "table_55920" WHERE "Season" = '2006-07'