Question

我有一张表列出了员工的服务电话。我有一个视图设置来查看表中的发票总和。

Select EmployeeID, SUM(InvoiceAmount) as "Total $ Amount Of Calls For January"
From Calls
WHERE Date BETWEEN '2013/01/01' AND '2013/01/31'
Group by EmployeeID

这很有效，但我每个月要查看12次，这看起来有点多余。我希望能够使用子查询显示EmployeeID，然后列出每个月的总数。

EmployeeID   JAN   FEB   MAR   APR ...
john         444   555   342   654
jim          945   675   232   465

我已经尝试了很多东西，甚至无法接近......我需要这样的东西，但是有效......

SELECT   
EmployeeID, 

(SELECT SUM(InvoiceAmount) FROM Orders WHERE DATE BETWEEN '2013/01/01' AND '2013/01/31') AS JAN,

(SELECT SUM(InvoiceAmount) FROM Orders WHERE DATE BETWEEN '2013/02/01' AND '2013/02/28') AS FEB,

(SELECT SUM(InvoiceAmount) FROM Orders WHERE DATE BETWEEN '2013/03/01' AND '2013/03/31') AS MAR,

FROM Calls

Answer 1

您可以这样做：

SELECT EmployeeID, 
    SUM(
        CASE
            WHEN strftime('%m', Date) = '01'
                THEN InvoiceAmount
            ELSE 0
        END) AS 'Jan',
    SUM(
        CASE
            WHEN strftime('%m', Date) = '02'
                THEN InvoiceAmount
            ELSE 0
        END) AS 'Feb',
    ...
    SUM(
        CASE
            WHEN strftime('%m', Date) = '12'
                THEN InvoiceAmount
            ELSE 0
        END) AS 'Dec'
FROM Calls
WHERE Date BETWEEN '2013-01-01' AND '2013-12-31'
GROUP BY EmployeeID

如果您正在查看某一年，这种情况很有效。

提交查询以根据日期返回多个列？

1 个答案:

See it in action