human
Schema:
chip_model (Model_name, Launch_year, RAM_MiB, ROM_MiB, Slots, WiFi, Bluetooth)
screen_mode (Graphics_mode, Char_cells, Pixels, Hardware_colours, used_kb, map, Type)
phone (Company_name, Hardware_Model_name, Accreditation_type, Accreditation_level, Date, chip_model, screen_mode)
Please answer with SQL.
assistant
Sure, I understand.
human
Tell me all the chip models.
assistant
SELECT model_name FROM chip_model;
human
Tell me all the chip models that are used by phones with full accreditation type.
assistant
SELECT T1.model_name FROM chip_model AS T1 JOIN phone AS T2 ON T1.Model_name = T2.chip_model WHERE T2.Accreditation_type = 'Full';
human
How about not used by any phone with full accreditation type?
assistant
SELECT model_name FROM chip_model EXCEPT SELECT chip_model FROM phone WHERE Accreditation_type = "Full" ;