Mysql 返回两列之和的查询

我使用下面的查询返回账单的合计、税额和合计金额和税额。但问题是，因为我使用的是sum（），它只返回第一行，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;

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您只需添加值即可获得总和：

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计和值：

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;

在这里，

sum（）。但是，带有汇总的
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;