mysql中Max Value的總和

Question

我嘗試從表中獲取最大值的總和：

select 
  a.sp_capex_01_master_key,
  a.sp_capex_01_master_wbs_id,
  format((
  (
    select
      sum(maxVal)
    from 
      (
        select max(w.sp_capex_01_trans_realisasi) as maxVal 
        from sp_capex_01.sp_capex_01_trans w 
        where w.sp_capex_01_master_wbs_id='P2-14101-01' 
        group by w.sp_capex_01_master_key 
      ) t
  ) / b.sp_capex_01_master_wbs_bud * 100
  ),2) as 'PerBudget'
from sp_capex_01_master a
join sp_capex_01.sp_capex_01_master_wbs b 
  on a.sp_capex_01_master_wbs_id=b.sp_capex_01_master_wbs_id;

如果我將值設置為w.sp_capex_01_master_wbs_id='P2-14101-01' ，則得到的結果值有誤。

但是當我將其更改為w.sp_capex_01_master_wbs_id=a.sp_capex_01_master_wbs_id ，我收到以下錯誤消息：

Error Code: 1054. Unknown column 'a.sp_capex_01_master_wbs_id' in 'where clause'    0.000 sec

如何獲得最大值的總和？

Answer 1

加入一個子查詢，該子查詢按您要匹配的列進行分組。

SELECT 
  a.sp_capex_01_master_key,
  a.sp_capex_01_master_wbs_id,
  FORMAT(sum_maxval / b.sp_capex_01_master_wbs_bud * 100, 2) AS PerBudget
FROM sp_capex_01_master a
JOIN sp_capex_01.sp_capex_01_master_wbs b ON a.sp_capex_01_master_wbs_id=b.sp_capex_01_master_wbs_id
LEFT JOIN (
    SELECT sp_capex_01_master_wbs_id, SUM(maxVal) AS sum_maxval
    FROM (
        select w.sp_capex_01_master_wbs_id, max(w.sp_capex_01_trans_realisasi) as maxVal 
        from sp_capex_01.sp_capex_01_trans w 
        group by w.sp_capex_01_master_wbs_id, w.sp_capex_01_master_key
    ) AS w1
    GROUP BY sp_capex_01_master_wbs_id
) AS w2 ON w2.sp_capex_01_master_wbs_id = a.sp_capex_01_master_wbs_id