CREATE TABLE table_68115 ("Player" CLOB, "Overs" FLOAT, "Figures" CLOB, "Opponent" CLOB, "Ground" CLOB)

How many overs occurred at Waca Ground against Queensland?
SELECT "Overs" FROM table_68115 WHERE "Ground" = 'waca ground' AND "Opponent" = 'queensland'
SELECT "Overs" FROM "table_68115" WHERE "Ground" = 'waca ground' AND "Opponent" = 'queensland'