Task: Text to Code
Input (English): Step 1: find the Model_name of chip_model table.
Step 2: For each row in phone table, find corresponding rows in chip_model table and in screen_mode table.
Step 3: find Model_name of the results of step 2 whose Type equals Full.
Step 4: show the rows that are in the results of step 1 but not in the results of step 3
Output (English): SELECT T1.Model_name FROM chip_model AS T1 EXCEPT SELECT T1.Model_name FROM chip_model AS T1 JOIN screen_mode AS T2 JOIN phone AS T3 ON T1.Model_name = T3.chip_model AND T3.screen_mode = T2.Graphics_mode WHERE T2.Type = "Full"