python - 从Python sql查询中的总和计算百分比/分数

Question

我有一个查询，可以获取某个城市的投诉数量。

query = '''
    select ComplaintType as complaint_type, City as city_name, 
    count(ComplaintType) complaint_count
    from data
    where city in ({})
    group by city_name, complaint_type
    order by city_name
'''.format(strs_to_args(TOP_CITIES))

投诉类型 City_name .Complain_

现在，我想创建一个列来计算城市中发生的类型 t 的投诉。类似于 count(ComplaintType)/sum(count(ComplaintType) in city)

完成此任务的最佳语法是什么？

query = '''
    select ComplaintType as complaint_type, City as city_name, 
    count(ComplaintType)/sum(count(ComplaintType) as complaint_freq

Answer 1

嗯，一种方法是在子查询中进行汇总并将结果连接到:

query = '''
    select d.ComplaintType as complaint_type, d.City as city_name, 
           count(*) as complaint_count,
           count(*) * 1.0 / max(cc.cnt) as ratio
    from data d cross join
         (select d.city, count(*) as cnt
          from data d
          group by d.city
         ) cc
         on d.city = cc.city
    where d.city in ({})
    group by d.city, d.complaint_type
    order by d.city
'''.format(strs_to_args(TOP_CITIES))