我有这个查询；
SELECT l.Name, COALESCE(SUM(A.Count), 0) AS A, COALESCE(SUM(B.Count), 0) AS B
FROM List l
LEFT JOIN A ON A.Name = l.Name
LEFT JOIN B ON B.Name = l.Name
GROUP BY l.Name
ORDER BY l.Name
而且查询结果不正确。
表A中的Product3的总和不正确。
您可以分别为A和B求和，然后合并结果：
SELECT Name, MAX(A) AS A, MAX(B) AS B
FROM (
SELECT l.Name, SUM(A.Count) AS A, 0 AS B
FROM List l
LEFT JOIN A ON A.Name = l.Name
GROUP BY l.Name
UNION ALL
SELECT l.Name, 0 AS A, SUM(B.Count)AS B
FROM List l
LEFT JOIN B ON B.Name = l.Name
GROUP BY l.Name) sub
GROUP BY Name
ORDER BY Name;
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我来说两句