查詢返回兩列總和

Question

我正在使用以下查詢來返回帳單總額和稅金的總額，稅額和總額。但問題是因爲我使用sum（）它只返回第一個如何檢索所有行和總計？

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

你可以只添加值獲得的總和：

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; 

然後，你可以做一個把戲，以獲得總與值一起，假設你在該行中有一個獨特的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; 

在這裏，sum()沒有什麼意思 - 因爲每個組中都有一行。但是，with rollup將添加一個總列，其中id爲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;