CREATE TABLE table_name_57 (model_number VARCHAR2, frequency VARCHAR2, voltage VARCHAR2)

Which Model number has a Frequency of 2000mhz and a Voltage of 0.75-1.2?
SELECT model_number FROM table_name_57 WHERE frequency = "2000mhz" AND voltage = "0.75-1.2"
SELECT "model_number" FROM "table_name_57" WHERE "0.75-1.2" = "voltage" AND "2000mhz" = "frequency"