CREATE TABLE table_74761 ("Event" TEXT, "Time" TEXT, "Nationality" TEXT, "Date" TEXT, "Meet" TEXT, "Location" TEXT)

Where were the 2008 championships with a time of 7:56.90 held?
SELECT "Location" FROM table_74761 WHERE "Meet" = '2008 championships' AND "Time" = '7:56.90'
SELECT "Location" FROM "table_74761" WHERE "Meet" = '2008 championships' AND "Time" = '7:56.90'