CREATE TABLE table_20411 ("No." FLOAT, "Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "To par" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

Name the total number when date is 30 may 2010
SELECT COUNT("No.") FROM table_20411 WHERE "Date" = '30 May 2010'
SELECT COUNT("No.") FROM "table_20411" WHERE "Date" = '30 May 2010'