CREATE TABLE table_6319 ("Competition" TEXT, "Played" FLOAT, "Blackpool" FLOAT, "Draw" FLOAT, "Preston North End" FLOAT)

Which Blackpool is the highest one that has a Draw larger than 18?
SELECT MAX("Blackpool") FROM table_6319 WHERE "Draw" > '18'
SELECT MAX("Blackpool") FROM "table_6319" WHERE "Draw" > '18'