PandaSQLException: (sqlite3.OperationalError) near "(": 语法错误，如何解决？

如何解决PandaSQLException: (sqlite3.OperationalError) near "(": 语法错误，如何解决？

我正在尝试使用 sql 语法查询 pandas 数据框。我导入了“import pandasql as ps”，并加载了一个数据框。然后我输入了这个简单的语法：

ps.sqldf(
    """
    SELECT department,first_name,AVG(salary) OVER (PARTITION BY department) AS average
    FROM employee
    GROUP BY department,salary
    """
    ).head()

它返回了这个错误：

PandasqlException                         Traceback (most recent call last)
<ipython-input-6-2ecbea651075> in <module>
----> 1 ps.sqldf(
      2     """
      3     SELECT department,AVG(salary) OVER (PARTITION BY department) AS average
      4     FROM employee
      5     GROUP BY department,salary

~/.pyenv/versions/3.9.0/lib/python3.9/site-packages/pandasql/sqldf.py in sqldf(query,env,db_uri)
    154     >>> sqldf("select avg(x) from df;",locals())
    155     """
--> 156     return Pandasql(db_uri)(query,env)

~/.pyenv/versions/3.9.0/lib/python3.9/site-packages/pandasql/sqldf.py in __call__(self,query,env)
     61                 result = read_sql(query,conn)
     62             except DatabaseError as ex:
---> 63                 raise PandasqlException(ex)
     64             except ResourceClosedError:
     65                 # query returns nothing

PandasqlException: (sqlite3.OperationalError) near "(": Syntax error
[sql: 
    SELECT department,salary
    ]
(Background on this error at: http://sqlalche.me/e/14/e3q8)

我尝试重写整个查询，从 notebook 中再次复制和粘贴，但仍然无法解决“(”问题。请你们告诉我如何修复 ti？