CREATE TABLE table_30012 ("Season" FLOAT, "Driver" CLOB, "Owner" CLOB, "No." FLOAT, "Manufacturer" CLOB, "Starts" CLOB, "Wins" FLOAT, "Top Tens" FLOAT, "Poles" FLOAT, "Points  ( margin ) " CLOB)

who is the manufacturer is no.50?
SELECT "Manufacturer" FROM table_30012 WHERE "No." = '50'
SELECT "Manufacturer" FROM "table_30012" WHERE "No." = '50'