查询不计算Invoice_Total列的总和

Question

I want to calculate the total sum of Invoice_Total as one Sum, not per row.

SELECT YEAR(Invoice_Date)as SalesYear, MONTH(Invoice_Date)as SalesMonth, Client_Name,Invoice_Total, SUM(Invoice_Total) AS TotalSales FROM INVOICE JOIN CLIENT ON CLIENT.Client_ID= INVOICE.Client_ID WHERE Invoice_Date between '2016-01-01'and'2016-01-31' GROUP BY Client_Name, Invoice_Date, Invoice_Total;

Answer 1

如果只是想要SUM作为一行，那么您可以从查询中删除GROUP BY，例如它可以很简单：

SELECT SUM(Invoice_Total)
FROM INVOICE
WHERE Invoice_Date BETWEEN '2016-01-01' AND '2016-01-31';

<强>更新

如果您希望现有查询中的SUM Invoice_Total（以及其他列），则可以将其包装到另一个查询中，例如：

SELECT SalesYear, SalesMonth, Client_Name, Invoice_Total, SUM(TotalSales) 
FROM (
 SELECT YEAR(Invoice_Date)as SalesYear, MONTH(Invoice_Date)as SalesMonth,   Client_Name,Invoice_Total, SUM(Invoice_Total) AS TotalSales FROM INVOICE
 JOIN CLIENT
 ON CLIENT.Client_ID= INVOICE.Client_ID
 WHERE Invoice_Date between '2016-01-01'and'2016-01-31'
 GROUP BY Client_Name, Invoice_Date, Invoice_Total
) a;

如果您不想要其他列（因为在所有行中打印相同的值没有多大意义），只需使用SELECT SUM(TotalSales) FROM...