Question

我需要一个帮助，查询总结果与另一个表的参考所以我有两个表，MASTER_DRAWING_ASSIGNED和FABRICATION

MASTER_DRAWING_ASSIGNED，

HEAD_MARK SUBCONT_ID PROJECT_NAME
---------------------------------
HEADMARKA BOBBY      PROCESSHOUSE
HEADMARKB BOBBY      PROCESSHOUSE
HEADMARKC ERIC       PROCESSHOUSE

FABRICATION

HEAD_MARK CURRENT_WEIGHT PROJECT_NAME
-------------------------------------
HEADMARKA 19.5           PROCESSHOUSE
HEADMARKA 23.4           PROCESSHOUSE
HEADMARKA 11.2           PROCESSHOUSE
HEADMARKB 23.3           PROCESSHOUSE
HEADMARKB 10.9           PROCESSHOUSE
HEADMARKC 11.0           PROCESSHOUSE
HEADMARKC 10.5           PROCESSHOUSE

所以有一天，我想知道BOBBY从FABRICATION当前体重中提取的总重量是多少。我发现这样做有些困难。请帮帮我

我的查询就像这样

SELECT SUM(CURRENT_WEIGHT)
       , MASTER_DRAWING_ASSIGNED.SUBCONT_ID 
FROM FABRICATION
     , MASTER_DRAWING_ASSIGNED 
WHERE MASTER_DRAWING_ASSIGNED.HEAD_MARK = FABRICATION.HEAD_MARK
MASTER_DRAWING_ASSIGNED.PROJECT_NAME = 'PROCESSHOUSE' 
AND MASTER_DRAWING_ASSIGNED.SUBCONT_ID = 'BOBBY'

Answer 1

我认为，你有一个错字和一个错过的GROUP BY条款。此外，您最好使用JOIN子句和表别名。

SELECT SUM(FABRICATION.CURRENT_WEIGHT),
       MASTER_DRAWING_ASSIGNED.SUBCONT_ID
FROM FABRICATION,
     MASTER_DRAWING_ASSIGNED
WHERE MASTER_DRAWING_ASSIGNED.HEAD_MARK = FABRICATION.HEAD_MARK AND MASTER_DRAWING_ASSIGNED.PROJECT_NAME = 'PROCESSHOUSE'
  AND MASTER_DRAWING_ASSIGNED.SUBCONT_ID = 'BOBBY'
GROUP BY MASTER_DRAWING_ASSIGNED.SUBCONT_ID

Answer 2

如果你想总和头部标记的总重量：

select subcont_id, project_name, head_mark, total_weight
  from master_drawing_assigned m
  left join
      (select head_mark hm, sum(current_weight) total_weight
         from fabrication group by head_mark) f
  on m.head_mark=f.hm
  where subcont_id='BOBBY' order by head_mark;

如果你想要总计一个项目的总重量：

select subcont_id, project_name, sum(total_weight) total_weight
  from master_drawing_assigned m
  left join
      (select head_mark hm, sum(current_weight) total_weight
         from fabrication group by head_mark) f
  on m.head_mark=f.hm
  where subcont_id='BOBBY' group by subcont_id, project_name;

您可以在 this fiddle

中查看结果

在oracle DB中使用SUM（）和另一个表的引用

2 个答案: