Question

我希望逐月使用逐个月获取每个月的数据。问题是，如果一个月没有数据，那么它会跳过月份。

这是我在MySQL中可以做的事情，还是我应该尝试在PHP中找到解决方案？我认为MySQL解决方案是最好的。

以下是我要进行的查询：

SELECT 
  MONTH(date) as g, 
  SUM(gross) AS revenue, 
  ABS(SUM(fee)) AS fee, COUNT(*) AS volume
FROM transactions
WHERE
  date BETWEEN DATE_SUB(NOW(), INTERVAL 1 YEAR) AND NOW() and
  gross > 0 and
  currency = 'USD'
GROUP BY g;

Answer 1

在我的一个项目中，我进行了此查询以获取＆＃39; navettes＆＃39;由莫伊斯＆＃39; （法语月份）＆＃39; @ annee＆＃39;这是我的参数（C＃）。你可能会受到启发......

select 
 max(nbNavettes) as nbNavettes,
 min(Mois) as Mois 
 from (
    select 
     count(*) as nbNavettes,
     DATE (concat(year(s.dateLiv), '-', month(s.dateLiv), '-', '01')) AS Mois 
     from (
        select 
         min(num_remorques.dateLiv) as dateLiv 
         from num_remorques
         group by 
          concat(num_remorques.dateLiv,'::',num_remorques.numRemorque)
     ) s
     where 
        year(s.dateLiv)=@annee
     group by 
        year(s.dateLiv),
        Month(s.dateLiv)

    union
     select 0 as nbNavettes,
     concat(@annee,'-01-01') as Mois
    union
     select 0 as nbNavettes,
     concat(@annee,'-02-01') as Mois
    union
     select 0 as nbNavettes,
     concat(@annee,'-03-01') as Mois
    union
     select 0 as nbNavettes,
     concat(@annee,'-04-01') as Mois
    union
     select 0 as nbNavettes,
     concat(@annee,'-05-01') as Mois
    union
     select 0 as nbNavettes,
     concat(@annee,'-06-01') as Mois
    union
     select 0 as nbNavettes,
     concat(@annee,'-07-01') as Mois
    union
     select 0 as nbNavettes,
     concat(@annee,'-08-01') as Mois
    union
     select 0 as nbNavettes,
     concat(@annee,'-09-01') as Mois
    union
     select 0 as nbNavettes,
     concat(@annee,'-10-01') as Mois
    union
     select 0 as nbNavettes,
     concat(@annee,'-11-01') as Mois
    union
     select 0 as nbNavettes,
     concat(@annee,'-12-01') as Mois

 ) s2
group by 
 s2.mois

请注意，我将monthes作为日期格式（yy-mm-01）而不是简单的int格式。对于您的使用，您应该替换

DATE (concat(year(s.dateLiv), '-', month(s.dateLiv), '-', '01')) AS Mois

类似

month(s.dateLiv) as Mois

和

concat(@annee,'-04-01') as Mois

（和所有相同的行）

4 as Mois

Answer 2

如果每个月至少有一行（即使是一个不匹配的行），那么你可以使用条件聚合来解决这个问题：

SELECT MONTH(date) as g, 
       SUM(CASE WHEN gross > 0 and currency = 'USD' THEN gross ELSE 0 END) AS revenue, 
       ABS(SUM(CASE WHEN gross > 0 and currency = 'USD' THEN fee ELSE 0 END)) AS fee,
       SUM(gross > 0 and currency = 'USD') AS volume
FROM transactions
WHERE date BETWEEN DATE_SUB(NOW(), INTERVAL 1 YEAR) AND NOW() and
GROUP BY g;

这不能保证有效。但有时这是解决此类问题的简单方法。

如果没有，那么您需要在具有所需月份的表格上使用LEFT JOIN。在PHP中完成工作可能更简单。

MySQL组日期填写缺少的日期

2 个答案: