数据汇总

Question

我有两个表格，我需要从中计算查看百分比。

表A有三列

Table A 

Program_id Viewing_Day Seconds_viewed 
------------------------------------- 
    1   1   520 
    1   2   330 
    1   3   650 
    1   5   100 
    2   1   90 
    2   3   80 
    2   4   560 
    2   6   980 
    2   7   1050 

表B有四列

Table B 

Program_id Reporting_day Total_Seconds Weight 
--------------------------------------------- 
    1   1    1800  1 
    1   3    1800  0.95 
    1   5    1800  0.9 
    1   7    1800  0.8 
    2   1    3600  1 
    2   3    3600  0.9 
    2   5    3600  0.8 
    2   7    3600  0.7 

需要计算观看百分比为每个Reporting_Day

Viewing_percentage = (SUM(Seconds_Viewed)/Total_seconds) * Weight * 100 

例来计算观看百分比为Program_id = 1和Reporting_Day = 5

因此，需要从表A

Table A 

Program_id Viewing_Day Seconds_viewed 
------------------------------------- 
    1   1   520 
    1   2   330 
    1   3   650 
    1   5   100 

总分第二名考虑所有记录Viewing_Day < = 5 Program_id = 1将是1600

对应表2的记录

Table B 

Program_id Reporting_day Total_Seconds Weight 
--------------------------------------------- 
    1   5    1800  0.9 

投入式

Viewing_percentage = ((520+330+650+100)/1800) * 100 * 0.9 = 80 

我需要计算所有和插入使成品表C

Table c 

Program_id Reporting_day Viewing_percentage 
-------------------------------------------- 
    1    1    28.88 - (520/1800) * 100 * 1 
    1    3    79.16 - (1500/1800) * 100 * 0.95 
    1    5    80.00 - Explained Above 
    1    7    71.11 - (1600/1800) * 100 * 0.8 
    2    1    2.50 - (90/3600) * 100 * 1 
    2    3    4.25 - (170/3600) * 100 * 0.9 
    2    5    16.22 - (730/3600) * 100 * 0.8 
    2    7    53.67 - (2760/3600) * 100 * 0.7 

我需要编写SQL的一样。我只能为每个Reporting_Day考虑UNION。 Reporting_Day将保持不变（1,3,5,7）

您能否在编写不使用UNION的SQL帮助？硬编码Reporting_Day（1,3,5,7）不是问题。

Answer 1

这是回答你的问题：

SELECT 
    program_id, 
    reporting_day, 
    CAST((CAST(total AS FLOAT)/CAST(total_seconds AS FLOAT)*100*weight) AS DECIMAL(5,2)) 
    AS viewing_percentage 
    FROM table_b 
     OUTER APPLY (
      SELECT 
        SUM(seconds_viewed) AS total 
        FROM table_a 
        WHERE table_a.program_id = table_b.program_id 
        AND table_a.viewing_day <= table_b.reporting_day 
     ) AS t 

我用的环境为Microsoft SQL Server 2014

Answer 2

如果你需要计算只有少数Reporting_days，那么这应该顺利：

select 
TableB.Program_Id, TableB.Reporting_Day, 
    case 
     when 
     TableB.Reporting_day = 7 
     then cast((TableA_TOT.tot_seven/TableB.Total_Seconds) * 100* TableB.Weight as decimal(5,2)) 
     when TableB.Reporting_day = 6 
     then cast((TableA_TOT.tot_six/TableB.Total_Seconds) * 100* TableB.Weight as decimal(5,2)) 
     when TableB.Reporting_day = 5 
     then cast((TableA_TOT.tot_five/TableB.Total_Seconds) * 100* TableB.Weight as decimal(5,2)) 
     when TableB.Reporting_day = 4 
     then cast((TableA_TOT.tot_four/TableB.Total_Seconds) * 100* TableB.Weight as decimal(5,2)) 
     when TableB.Reporting_day = 3 
     then cast((TableA_TOT.tot_three/TableB.Total_Seconds) * 100* TableB.Weight as decimal(5,2)) 
     when TableB.Reporting_day = 2 
     then cast((TableA_TOT.tot_two/TableB.Total_Seconds) * 100* TableB.Weight as decimal(5,2)) 
     when TableB.Reporting_day = 1 
     then cast((TableA_TOT.tot_one/TableB.Total_Seconds) * 100* TableB.Weight as decimal(5,2)) 
     else 0 
    end weight 
from TableB 
inner join 
(
    select 
    TA_TOT.program_id, 
    sum(TA_TOT.tot_seven) tot_seven, 
    sum(TA_TOT.tot_six) tot_six, 
    sum(TA_TOT.tot_five) tot_five, 
    sum(TA_TOT.tot_four) tot_four, 
    sum(TA_TOT.tot_three) tot_three, 
    sum(TA_TOT.tot_two) tot_two, 
    sum(TA_TOT.tot_one) tot_one 
    from 
    (
     select 
     TA_grp.program_id, 
     case when TA_grp.seven = '1_7' then sum(TA_grp.Seconds_viewed) else 0 end tot_seven, 
     case when TA_grp.six = '1_6' then sum(TA_grp.Seconds_viewed) else 0 end tot_six, 
     case when TA_grp.five = '1_5' then sum(TA_grp.Seconds_viewed) else 0 end tot_five, 
     case when TA_grp.four = '1_4' then sum(TA_grp.Seconds_viewed) else 0 end tot_four, 
     case when TA_grp.three = '1_3' then sum(TA_grp.Seconds_viewed) else 0 end tot_three, 
     case when TA_grp.two = '1_2' then sum(TA_grp.Seconds_viewed) else 0 end tot_two, 
     case when TA_grp.one = '1_1' then sum(TA_grp.Seconds_viewed) else 0 end tot_one 
     from 
     (
     select 
     TableA.Program_id, TableA.viewing_day, TableA.Seconds_viewed, 
     case when TableA.viewing_day <= 7 then '1_7' else '' end seven, 
     case when TableA.viewing_day <= 6 then '1_6' else '' end six, 
     case when TableA.viewing_day <= 5 then '1_5' else '' end five, 
     case when TableA.viewing_day <= 4 then '1_4' else '' end four, 
     case when TableA.viewing_day <= 3 then '1_3' else '' end three, 
     case when TableA.viewing_day <= 2 then '1_2' else '' end two, 
     case when TableA.viewing_day <= 1 then '1_1' else '' end one 
     FROM TableA 
    ) TA_grp 
     group by program_id, five, four, three, two, one 
    ) TA_TOT 
    group by TA_TOT.program_id 
) TableA_TOT 
on TableB.Program_id = TableA_TOT.Program_Id