两个日期之间的mySQL查询问题与sum

Question

我有下一张名为expense_partial_payment的表。

我的查询是下一个，我需要将amount_paid的总和作为total_paid：

SELECT id_partial_payment, epp.id_billing, epp.id_user, epp.month_of_payment,  
            COALESCE(SUM(epp.amount_paid),0) AS total_paid,
            (be.total - amount_paid) AS pending_total , be.total as total

            FROM expenses_partial_payment epp 
            INNER JOIN BillingExpenses be  ON epp.id_billing = be.id_billing
            WHERE epp.id_user = 23 

但是当我在

中加入子句时

WHERE epp.id_user = 23 AND  (Month_of_payment BETWEEN '2015-01-01' AND LAST_DAY('2016-01-01'))

我有一个total_piad错误，查询只返回最后一行（300）并且没有求和amount_paid，正确的总和必须是501.00

我该怎么做才能获得正确的总和，添加子句来过滤month_of_payment

  

（month_of_payment BETWEEN'2015-01-01'和LAST_DAY（'2016-01-01'））

Answer 1

month_of_payment BETWEEN＆＃39; 2015-01-01＆＃39;和LAST_DAY（＆＃39; 2016-01-01＆＃39;）

last day（）返回月份的最后一天而不是年份。所以它不会在一个月内提取数据。

Answer 2

尝试用此

替换您的日期

STR_TO_DATE('01/01/2015', '%m/%d/%Y')