CREATE TABLE table_30234 ("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 winners from previous round were there in the semi finals?
SELECT "Winners from previous round" FROM table_30234 WHERE "Round" = 'Semi finals'
SELECT "Winners from previous round" FROM "table_30234" WHERE "Round" = 'Semi finals'