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))

ComplaintType City_name。投诉_

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

实现此目的的最佳语法是什么？

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

Answer 1

好吧，一种方法是在子查询中进行汇总并将结果加入：

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))

在python sql查询中计算总和的百分比/分数

1 个答案: