查询入库数量最多的物料（旺季备货-大量数据）

def solve():
    import sqlite3
    import pandas as pd
    
    conn = sqlite3.connect(':memory:')
    
    base_url = 'https://liangdaima.com/static/data/crm/state_04/'
    
    tables = ['suppliers', 'customers', 'products', 
              'stock_in', 'stock_in_items', 
              'stock_out', 'stock_out_items']
    
    for table in tables:
        try:
            url = base_url + table + '.csv'
            df = pd.read_csv(url)
            df.to_sql(table, conn, index=False)
        except Exception as e:
            pass
    
    result = conn.execute('SELECT 物料编码, SUM(数量) AS 总数 FROM stock_in_items GROUP BY 物料编码 ORDER BY 总数 DESC LIMIT 3').fetchall()
    conn.close()
    return result