Table: garda_circuit_22_may
Columns: name
circuit
date
winning_driver
winning_constructor
report

Question: What race did eugenio silvani win?
SQL: SELECT "name" FROM garda_circuit_22_may WHERE "winning_driver" = 'eugenio silvani'

Question: Which race did Mercedes win?
SQL: SELECT "name" FROM garda_circuit_22_may WHERE "winning_constructor" = 'mercedes'

Question: Which circuit did alfa romeo win?
SQL: SELECT "circuit" FROM garda_circuit_22_may WHERE "winning_constructor" = 'alfa romeo'