CREATE TABLE table_55423 ("Date" CLOB, "Visitor" CLOB, "Score" CLOB, "Home" CLOB, "Decision" CLOB, "Attendance" FLOAT, "Series" CLOB)

What was the attendance of april 17?
SELECT SUM("Attendance") FROM table_55423 WHERE "Date" = 'april 17'
SELECT SUM("Attendance") FROM "table_55423" WHERE "Date" = 'april 17'