mysql - SQL Sum 没有返回正确的数据

Question

我的 Progress 数据库的示例，opdetail 表

invoice  invline    article   size    qty
----------------------------------------
905155   1          Shoe      10      5
905155   2          Slipper   3       2
905155   2          Slipper   4       6
905155   2          Slipper   5       1
905156   1          Boot      10      1 
905156   1          Boot      11      1
905157   1          Slipper   5       4       
905157   2          Shoe      8       6

a simple SQL select statement, run from the OpenEdge editor returns just what I need, a list of invoices with their total quantities:-

SELECT invoice, sum(qty) FROM opdetail GROUP BY qty ORDER BY invoice ASC

905155  14
905156   2
905157  10

HOWEVER:- When run from an ASP page via DSN I have to list both fields in the GROUP BY otherwise progress returns a GROUP BY error

SELECT invoice, sum(qty) FROM opdetail GROUP BY qty, invoice ORDER BY invoice ASC

905155   5
905155   9
905156   2 
905157   4
905157   6

它没有总结数量，而且似乎考虑了行号，即使行号在我的 sql 语句中没有任何作用。任何人都可以对此有所了解，或者我如何在考虑行号的情况下对总数量求和？谢谢!

Answer 1

您在聚合函数中使用 qty 然后在 group by 上使用这没有任何意义，您应该在一些上使用 group by其他栏目作为

SELECT 
invoice, 
sum(qty) FROM opdetail 
GROUP BY invoice ORDER BY invoice ASC