我需要帮助查询来自另一个表的引用的总和结果，因此我有两个表MASTER_DRAWING_ASSIGNED和FABRICATION
MASTER_DRAWING_ASSIGNED，
HEAD_MARK SUBCONT_ID PROJECT_NAME
---------------------------------
HEADMARKA BOBBY PROCESSHOUSE
HEADMARKB BOBBY PROCESSHOUSE
HEADMARKC ERIC PROCESSHOUSE
制造
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
因此，有一天，我想了解一下BOBBY从FABRICATION中当前重量中提取的总重量能得到多少。我很难做到这一点。请帮我
我的查询是这样的
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'
我认为您有错别字和漏写的GROUP BY子句。另外，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
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我来说两句