Question

SQL Server：

SELECT tblModule.Title , Count (tblActivity.Name) AS NumberOfActivities 
From tblActivity
INNER JOIN tblModule 
  ON tblModule.ModuleID = tblActivity.ModuleID
  Order by tblModule.Title

在这里，我试图显示每个模块标题的名称在tblActivity中显示的次数，我将如何做到这一点错误是：

 Msg 8120, Level 16, State 1, Line 1
Column 'tblModule.Title' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

实际问题：对于每个模块，列出模块标题和为模块安排的活动数量。（5）

Answer 1

SELECT m.Title, COUNT_BIG(a.Name) AS NumberOfActivities 
FROM dbo.tblActivity a
JOIN dbo.tblModule m ON m.ModuleID = a.ModuleID
GROUP BY m.Title
ORDER BY m.Title

或

SELECT m.Title, NumberOfActivities
FROM (
    SELECT ModuleID, COUNT_BIG(*) AS NumberOfActivities 
    FROM dbo.tblActivity
    GROUP BY ModuleID
) a
JOIN dbo.tblModule m ON m.ModuleID = a.ModuleID
ORDER BY m.Title

无论如何，请提供实际和例外的结果......

如何显示出现事件的次数

1 个答案: