CREATE TABLE table_59456 ("Name" CLOB, "Circuit" CLOB, "Date" CLOB, "Winning driver" CLOB, "Winning constructor" CLOB, "Report" CLOB)

Name the Date of mercedes, and a Circuit of elgin?
SELECT "Date" FROM table_59456 WHERE "Winning constructor" = 'mercedes' AND "Circuit" = 'elgin'
SELECT "Date" FROM "table_59456" WHERE "Circuit" = 'elgin' AND "Winning constructor" = 'mercedes'