Question

我有这个观点：

ALTER VIEW [dbo].[vw_HoursTakenPerEmployee] AS
SELECT e.[EmployeeID], 
       COALESCE(SUM(hrf.[HoursTaken]), 0) AS HoursTaken
FROM [dbo].[Employee] e LEFT JOIN
     [dbo].[HolidayRequestForm] hrf
      ON e.[EmployeeID] = hrf.[EmployeeID]
GROUP BY e.[EmployeeID];
GO

holidayRequestform表看起来像这样。

 EmployeeID  | HoursTaken     | YearRequested  | MonthRequested |
 ------------+----------------+ ---------------+----------------+
 1           | 8              | 2018           |06
 1           | 16             | 2019           |01
 2           | 8              | 2019           |01
 3           | 8              | 2018           |01

当我选择视图时，结果如下：

EmployeeID|HoursTaken
----------+----------
 1        |24
 2        |8
 3        |8

但是，我只想查看“计算当年（2019）”的小时数，同时仍保留前几年的记录。

我尝试在视图中插入WHERE YearRequested = YEAR(GETDATE())子句，但不确定将其放置在何处。

Answer 1

答案是

ALTER VIEW [dbo].[vw_HoursTakenPerEmployee] AS
SELECT e.[EmployeeID], 
       COALESCE(SUM(hrf.[HoursTaken]), 0) AS HoursTaken
FROM [dbo].[Employee] e LEFT JOIN
     [dbo].[HolidayRequestForm] hrf
      ON e.[EmployeeID] = hrf.[EmployeeID]
WHERE hrf.YearRequested = YEAR(GETDATE())
GROUP BY e.[EmployeeID];
GO

**只是您视图名称的提示。给它指定一个表示年份过滤器的名称

Answer 2

ALTER VIEW [dbo].[vw_HoursTakenPerEmployee] AS
SELECT e.[EmployeeID], 
       COALESCE(SUM(hrf.[HoursTaken]), 0) AS HoursTaken
FROM [dbo].[Employee] e LEFT JOIN
     [dbo].[HolidayRequestForm] hrf
      ON e.[EmployeeID] = hrf.[EmployeeID]
WHERE YearRequested = YEAR(GETDATE()) 
GROUP BY e.[EmployeeID];
GO

-SQL中的SELECT子句按此顺序

SELECT
Columns
FROM TABLEA 
WHERE 
GROUP BY
ORDER BY

SQL Server是否在视图中添加Where子句？

2 个答案: