CREATE TABLE table_17800 ("Club" TEXT, "Played" TEXT, "Won" TEXT, "Drawn" TEXT, "Lost" TEXT, "Points for" TEXT, "Points against" TEXT, "Tries for" TEXT, "Tries against" TEXT, "Try bonus" TEXT, "Losing bonus" TEXT, "Points" TEXT)

How many draws were there when there were 30 tries against?
SELECT "Drawn" FROM table_17800 WHERE "Tries against" = '30'
SELECT "Drawn" FROM "table_17800" WHERE "Tries against" = '30'