Question

这是表：

class APIBackoffInterrupt(Base): 
    """ 
    When a user calls a Google API method, and it returns 403 or 429, we should apply an exponential backoff 
    """ 
    __tablename__ = 'backoff_interrupt' 
    _id = Column(Unicode(36), primary_key=True) 
    user_id = Column(Unicode(36)) 
    date_created_utc = Column(DateTime) 
    expiry_date_utc = Column(DateTime, nullable=True) 
    exponent = Column(Integer, default=-1) 

我喜欢让所有独特user_id，由date_created_utc（DESC）排序，其中expiry_date_utc是<当前UTC现在。

我该怎么做？

Answer 1

q1 = (session.query(APIBackoffInterrupt, 
         func.rank().over(order_by=desc(APIBackoffInterrupt.date_created_utc), 
             partition_by=APIBackoffInterrupt.user_id).label('rnk')) 
     ).subquery() 
    q2 = (session.query(q1) 
      .filter(q1.c.rnk == 1) 
      .filter(q1.c.expiry_date_utc < datetime.datetime.utcnow()) 
     ) 

Answer 2

select distinct user_id 
from backoff_interrupt 
    where expiry_date_utc <getdate() 
order by date_created_utc desc 

检查这一项： 更新：

select * into #temp from backoff_interrupt 
where expiry_date_utc <getdate() 
order by date_created_utc desc 

    select distinct user_Id from #temp 

drop #temp