查询返回两列总和

Question

我正在使用以下查询来返回帐单总额和税金的总额，税额和总额。但问题是因为我使用sum（）它只返回第一个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

你可以只添加值获得的总和：

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，你可以做一个把戏，以获得总与值一起，假设你在该行中有一个独特的id ：

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()没有什么意思 - 因为每个组中都有一行。但是，with rollup将添加一个总列，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;