CREATE TABLE table_8790 ("Margin" FLOAT, "Score" TEXT, "Winning Team" TEXT, "Losing Team" TEXT, "Venue" TEXT, "Date" TEXT)

What is the Margin, when Date is 19 July 2008 (Round 19)?
SELECT "Margin" FROM table_8790 WHERE "Date" = '19 july 2008 (round 19)'
SELECT "Margin" FROM "table_8790" WHERE "Date" = '19 july 2008 (round 19)'