CREATE TABLE table_78157 ("Year" TEXT, "Competition" TEXT, "Date" TEXT, "Location" TEXT, "Score" TEXT, "Result" TEXT)

what is the date for the game in prague for the world group, consolation round competition?
SELECT "Date" FROM table_78157 WHERE "Location" = 'prague' AND "Competition" = 'world group, consolation round'
SELECT "Date" FROM "table_78157" WHERE "Competition" = 'world group, consolation round' AND "Location" = 'prague'