CREATE TABLE table_204_77 (id NUMBER, "number" CLOB, "builder" CLOB, "type" CLOB, "date" CLOB, "works number" NUMBER, "notes" CLOB)

how many different types of diesel locomotives came from baldwin locomotive works ?
SELECT COUNT(DISTINCT "type") FROM table_204_77 WHERE "builder" = 'baldwin locomotive works'
SELECT COUNT(DISTINCT "type") FROM "table_204_77" WHERE "builder" = 'baldwin locomotive works'