Task: Text to Code
Input (English): Step 1: For each row in Characteristics table, find the corresponding rows in Product_Characteristics table.
Step 2: find the number of rows of each value of Product_Characteristics's characteristic_id in the results of step 1.
Step 3: find characteristic_name in the results of step 1 whose corresponding value in step 2 is greater than or equals 2
Output (English): SELECT T1.characteristic_name FROM Characteristics AS T1 JOIN Product_Characteristics AS T2 ON T1.characteristic_id = T2.characteristic_id GROUP BY T2.characteristic_id HAVING Count ( * ) > = 2