Question

我有3个表my_stamp，my_invoice和stamp 现在我想从邮票表中得到价格的总和。这是我目前的SQL查询。

$sql= "SELECT s.country, s.stamp_no, s.year, s.sgno, s.condition, SUM(ssk.price) as psum ";       
$sql_cnt = "SELECT s.stamp_no AS num ";
$frm     = "FROM  stamp AS ssk ,my_stamp AS s, my_invoice AS sk ";

 $filter  = "WHERE s.invoice_id=sk.invoice_id AND ssk.stamp_no=s.stamp_no AND sk.cusid='" . $usr . "'";

   $sql_cnt = $sql_cnt . $frm . $filter. " Group by s.stamp_no";

查询工作正常。我的主要问题是psum没有得到总价。当我遍历结果时，它会获得单独的价格。

有人可以帮助我在mysql中使用这个SUM吗？感谢。

edit ::这是我得到的最终sql：

SELECT s.country, s.stamp_no, s.year, s.sgno, s.condition, SUM(ssk.price) as psum FROM    stamp AS ssk ,my_stamp AS s, my_invoice AS sk WHERE s.invoice_id=sk.invoice_id AND     ssk.stamp_no=s.stamp_no AND sk.cusid='10' Group by s.stamp_no ORDER BY s.country, s.sgno ASC     LIMIT 0,20

Answer 1

$ sql中的查询没有group by，所以它只是返回那些行ssk.price。

Answer 2

您的查询中似乎错过了GROUP BY：

SELECT s.country, s.stamp_no, s.year, s.sgno, s.condition, SUM(ssk.price) as psum
GROUP BY 1, 2, 3, 4, 5

mysql SUM不能与AS一起使用

2 个答案: