CREATE TABLE table_76049 ("Round" CLOB, "Main date" CLOB, "Number of fixtures" FLOAT, "Clubs" CLOB, "New entries this round" CLOB)

What is the sum of Number of fixtures when the rounds shows quarter-finals?
SELECT SUM("Number of fixtures") FROM table_76049 WHERE "Round" = 'quarter-finals'
SELECT SUM("Number of fixtures") FROM "table_76049" WHERE "Round" = 'quarter-finals'