mysql - 查询返回两列的总和

Question

我使用以下查询返回账单的总计、税金以及总金额和税金的总计。但问题是因为我使用 sum() 它只返回第一个我如何检索所有行和总计？

SELECT sum(
            at_salesbill.`billedTotal` + at_salesbill.`billedTotalTax`
            ) as grantTotal,
       at_salesbill.`billedTotal` AS at_salesbill_billedTotal,
       at_salesbill.`billedTotalTax` AS billedTotalTax,
  FROM at_salesbill
 WHERE at_salesbill.`billGuid` = 44;

Answer 1

您只需将这些值相加即可得出总和:

SELECT (at_salesbill.`billedTotal`+at_salesbill.`billedTotalTax`) as grantTotal,
       at_salesbill.`billedTotal` AS at_salesbill_billedTotal,
       at_salesbill.`billedTotalTax` AS billedTotalTax,
from at_salesbill
where at_salesbill.`billGuid` = 44;

然后，假设行中有一个唯一的 id，您可以使用一个技巧来获取总数和值:

SELECT at_salesbill.id,
       sum(at_salesbill.`billedTotal`+at_salesbill.`billedTotalTax`) as grantTotal,
       at_salesbill.`billedTotal` AS at_salesbill_billedTotal,
       at_salesbill.`billedTotalTax` AS billedTotalTax,
from at_salesbill
where at_salesbill.`billGuid` = 44
group by at_salesbill.id with rollup;

这里，sum() 没有做任何有趣的事情——因为每组中有一行。但是，with rollup 将添加一个总计列，其中 id 为 NULL。

SELECT (case when at_salesbill.id is NULL then 'total' else '' end),
       sum(at_salesbill.`billedTotal`+at_salesbill.`billedTotalTax`) as grantTotal,
       at_salesbill.`billedTotal` AS at_salesbill_billedTotal,
       at_salesbill.`billedTotalTax` AS billedTotalTax,
from at_salesbill
where at_salesbill.`billGuid` = 44
group by at_salesbill.id with rollup;