CREATE TABLE table_51986 ("Race Name" CLOB, "Circuit" CLOB, "Date" CLOB, "Winning driver" CLOB, "Constructor" CLOB, "Report" CLOB)

Which Constructor has Pergusa in the Circuit?
SELECT "Constructor" FROM table_51986 WHERE "Circuit" = 'pergusa'
SELECT "Constructor" FROM "table_51986" WHERE "Circuit" = 'pergusa'