CREATE TABLE table_12031 ("Race" CLOB, "Length" CLOB, "Class" CLOB, "Circuit" CLOB, "Date" CLOB)

What circuit was on June 1 with a class of both?
SELECT "Circuit" FROM table_12031 WHERE "Class" = 'both' AND "Date" = 'june 1'
SELECT "Circuit" FROM "table_12031" WHERE "Class" = 'both' AND "Date" = 'june 1'