Question

我如何在Rails终端上编写此查询？

select
    month(created_at) as 'mês',
    sum(points) as 'total de pontos',
    count(*) as 'operações',
    avg(points) as 'média'
from
    cashmilhas_07_16.operations
where
    operation_type = 1
    and created_at >= '2018-01-01'
group by
    year(created_at),
    month(created_at)

Answer 1

最简单的是：

Operation.find_by_sql [
  'select
      month(created_at) as "mês",
      sum(points) as "total de pontos",
      count(*) as "operações",
      avg(points) as "média"
    from cashmilhas_07_16.operations
    where operation_type = :type and created_at >= :date
    group by year(created_at), month(created_at)',
  { type: 1, date: '2018-01-01' }
]

或者：

Operation.where("operation_type = :type and created_at >= :date", { type: 1, date: '2018-01-01' })
         .select('month(created_at) as "mês", sum(points) as "total de pontos", count(*) as "operações", avg(points) as "média"')
         .group("year(created_at), month(created_at)")

这两种方法在Rails API

中都有很好的描述

Answer 2

我使用这种方法：

sql =“ SELECT MONTH（created_at）为'mês'，sum（points）为'total de pontos'，count（*）为'operações'，avg（points）为'média'，avg（cost）as 'customédio'，avg（cost）*（sum（points）/ 10000）as'gasto total'FROM operation其中operation_type = 2 AND source_target_id = 1 AND created_at> ='2018-01-01'GROUP BY YEAR（created_at），MONTH（created_at）;“

结果= ActiveRecord :: Base.connection.exec_query（sql）

results.rows

将SQL查询转换为ActiveRecord查询

2 个答案: