[英]Join tables based on matching criteria and Subtract the sum of Table2.Quantity from sum of Table1.Quantity for matching rows
我使用下面的代码:table1-add,table2-remove
SELECT add.description, add.size, (sum(add.qty) - sum(remove.qty)) AS OnHand
`FROM add LEFT JOIN remove ON (add.description = remove.description) AND `(add.size = remove.size)
group by add.description, add.size
OnHand FROM add RIGHT JOIN remove ON (add.description = remove.description) AND
(add.size = remove.size) WHERE add.description IS NULL and add.size is null
group by add.description, add.size;
我的目标在标题中表达。
我尝试了一些其他的方法,但它没有在减法之前对列进行求和。 它仅减去第一个匹配的条目。
其他方法:
SELECT add.description, add.size, sum(add.qty) - sum(remove.qty) AS OnHand
FROM add INNER JOIN remove
ON add.description = remove.description
WHERE add.size = remove.size
GROUP BY add.description, add.size;
看起来你需要先做组,计算每个表的总和 - 然后进行减法;
SELECT t1.description, t1.size, (sum_add - sum_rem) AS OnHand
FROM
( SELECT add.description, add.size, sum(add.qty) as sum_add from add GROUP BY add.description, add.size )t1
INNER JOIN
( SELECT remove.description, remove.size, sum(remove.qty) as sum_rem from remove GROUP BY remove.description, remove.size )t2
ON t1.description = t2.description and t1.size = t2.size
代码未经测试,可能以更好的方式完成 - 但这应该有效。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.