CREATE TABLE table_30238 ("Round" TEXT, "Clubs remaining" FLOAT, "Clubs involved" FLOAT, "Winners from previous round" TEXT, "New entries this round" TEXT, "Leagues entering at this round" TEXT)

How many clubs were involved in the second round?
SELECT "Clubs involved" FROM table_30238 WHERE "Round" = 'Second round'
SELECT "Clubs involved" FROM "table_30238" WHERE "Round" = 'Second round'