CREATE TABLE table_20541 ("Species" CLOB, "Indole" CLOB, "Methyl Red" CLOB, "Voges-Proskauer" CLOB, "Citrate" CLOB)

Which species show a negative result with both voges-proskauer and indole?
SELECT "Species" FROM table_20541 WHERE "Voges-Proskauer" = 'Negative' AND "Indole" = 'Negative'
SELECT "Species" FROM "table_20541" WHERE "Indole" = 'Negative' AND "Voges-Proskauer" = 'Negative'