类型转换CAST

def solve():
    import sqlite3
    import pandas as pd
    conn = sqlite3.connect(':memory:')
    df = pd.read_csv('https://liangdaima.com/static/data/german_credit_risk.csv')
    df.to_sql('german_credit_risk', conn, index=False)
    result = conn.execute('SELECT CAST("Credit amount" AS TEXT) AS amount_str FROM german_credit_risk LIMIT 5').fetchall()
    conn.close()
    return result