Question

我试图找出库存数据库中特定客户的总金额。表格是：客户，税，发票，line_no，分支，项目，员工

我能够计算总数，但我得到多个金额，因为它计算数据库中每个税率的金额。我试图根据分支机构的问题来限制金额。我希望我说清楚，这是查询：

SELECT  ROUND((SUM((LINE_NO.RETAIL_PRICE - LINE_NO.DISCOUNT)* LINE_NO.DEL_QTY)* (TAX.TAX_RATE))+
SUM((LINE_NO.RETAIL_PRICE - LINE_NO.DISCOUNT)* LINE_NO.DEL_QTY),2)
AS "TOTAL PAYMENT" 
FROM LINE_NO, TAX, BRANCH
WHERE LINE_NO.INVOICE_INVOICE_NO IN (SELECT INVOICE.INVOICE_NO from INVOICE
WHERE(INVOICE.CUSTOMER_CUST_NO IN (SELECT CUST_NO from CUSTOMER where CUSTOMER.FNAME='JIM' ))) 
AND TAX.CITY = BRANCH.CITY
GROUP BY TAX.TAX_RATE;

Answer 1

GROUP BY不应在此操作TAX_RATE以避免计算每组的总金额（TAX_RATE）。

SELECT  ROUND((SUM((LINE_NO.RETAIL_PRICE - LINE_NO.DISCOUNT)* LINE_NO.DEL_QTY)* (TAX.TAX_RATE))+
SUM((LINE_NO.RETAIL_PRICE - LINE_NO.DISCOUNT)* LINE_NO.DEL_QTY),2)
AS "TOTAL PAYMENT" 
FROM LINE_NO, TAX, BRANCH
WHERE LINE_NO.INVOICE_INVOICE_NO IN (SELECT INVOICE.INVOICE_NO from INVOICE
WHERE(INVOICE.CUSTOMER_CUST_NO IN (SELECT CUST_NO from CUSTOMER where CUSTOMER.FNAME='JIM' ))) 
AND TAX.CITY = BRANCH.CITY;

Answer 2

准确。是的，可以从分支机构位置检索费率，可以通过发票编号进行跟踪。所以我在之后添加了另一个查询：

AND TAX.CITY = BRANCH.CITY

这有助于确定我正在寻找并使其正常运转的税率，无论如何，谢谢

在SQL中查找客户总数

2 个答案: