SQL 基本：按 function 分组

Question

我正在尝试获得一个按功能概述两组但有一些小困难的表格。

select 
    to_char("CreateTime", 'YYYY-MM') as MonthYear,
    floor(sum("Time"))::integer / 60 as "#MinutesWorkouts",
    sum(case when "Type" = 29 then 1 else 0 end) as "#Streaming",
    (sum(case when "Type" = 29 then "Time" else 0 end))::integer / 60 as "StreamingMinutes",
    sum(case when "Type" = 9 then 1 else 0 end) as "#GuidedProgram",
    sum(case when "Type" = 28 then 1 else 0 end) as "#Tall"
from 
    match_history
WHERE
    "MachineId" = {{Machine_Id}}
GROUP by 
    to_char("CreateTime", 'YYYY-MM')

理想情况下 - 我想在列中展示机器 ID 以及日期。 目前结果显示为（图片链接），因为它仅将月份显示为组 function。 我想确保它也在列上显示机器 ID，因为我想添加多个机器 ID。

Answer 1

为什么不只添加 machine_id？

select 
    to_char("CreateTime", 'YYYY-MM') as MonthYear,
    "MachineId",
    floor(sum("Time"))::integer / 60 as "#MinutesWorkouts",
    sum(case when "Type" = 29 then 1 else 0 end) as "#Streaming",
    (sum(case when "Type" = 29 then "Time" else 0 end))::integer / 60 as "StreamingMinutes",
    sum(case when "Type" = 9 then 1 else 0 end) as "#GuidedProgram",
    sum(case when "Type" = 28 then 1 else 0 end) as "#Tall"
from 
    match_history
GROUP by 
    to_char("CreateTime", 'YYYY-MM'), "MachineId"