使用mySQL的GROUP_CONCAT之后的SUM数据

Question

我正在使用phpMyAdmn，我在mySQL中有这个查询：

SELECT BIL_Date, BIL_Rate, BIL_Quantity,
GROUP_CONCAT(COALESCE(STX_Amount, "0")) AS ApplicableTaxesRate
FROM ___BillableDatas
LEFT JOIN ___SalesTaxes
  ON FIND_IN_SET(STX_Id, BIL_ApplicableTaxes) > 0
WHERE BIL_HotelId='cus_CNHLMiMOzP5cuM'
  AND BIL_BookingId='2'
ORDER BY BIL_Date
ASC

这里是表结构的SQL小提琴： http://sqlfiddle.com/#!9/49ee80/8

如何使用ApplicableTaxesRate数据（5.000,5.000,23.000,23.000）来计算这些数据的总和？

所以我应该56.00。

感谢。

Answer 1

试试这个：

SELECT BIL_Date, BIL_Rate, BIL_Quantity,
GROUP_CONCAT(COALESCE(STX_Amount, "0")) AS ApplicableTaxesRate,SUM(STX_Amount)as sum
FROM ___BillableDatas
LEFT JOIN ___SalesTaxes
ON FIND_IN_SET(STX_Id, BIL_ApplicableTaxes) > 0
WHERE BIL_HotelId='cus_CNHLMiMOzP5cuM'
AND BIL_BookingId='2'
ORDER BY BIL_Date
ASC