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中级

GROUP BY：多列分组

未完成
中级参考 代码结构已给出，请填写 ____ 处 
def solve():
    import sqlite3
    import pandas as pd
    conn = sqlite3.connect(____)
    df = pd.read_csv(____)
    df.to_sql(____)
    result = conn.execute(____).fetchall()
    conn.close()
    return result

示例

输入
print(solve())
期望输出
[('business', 'bad', 34), ('business', 'good', 63), ('car', 'bad', 106), ('car', 'good', 231), ('domestic appliances', 'bad', 4), ('domestic appliances', 'good', 8), ('education', 'bad', 23), ('education', 'good', 36), ('furniture/equipment', 'bad', 58), ('furniture/equipment', 'good', 123), ('radio/TV', 'bad', 62), ('radio/TV', 'good', 218), ('repairs', 'bad', 8), ('repairs', 'good', 14), ('vacation/others', 'bad', 5), ('vacation/others', 'good', 7)]
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