CREATE TABLE table_20542 ("Species" CLOB, "Indole" CLOB, "Methyl Red" CLOB, "Voges-Proskauer" CLOB, "Citrate" CLOB)

What are the results for testing the species with voges-proskauer when citrate yields a positive result?
SELECT "Voges-Proskauer" FROM table_20542 WHERE "Citrate" = 'Positive'
SELECT "Voges-Proskauer" FROM "table_20542" WHERE "Citrate" = 'Positive'