在SQL视图中添加行数

我正在尝试使用SQL视图创建一个表。它假设在问题表中的每一行中添加一列，该列将具有给定该问题答案的整数值。这就是我到目前为止所做的：

CREATE VIEW [dbo].[Question]
AS
    SELECT 
       COUNT(answer.Id) as 'Answers',
       question.Id,
       question.CreatorId,
       question.Title,
       question.Content,
       question.CreationDate
    FROM 
       Questions AS question 
    JOIN 
       Answers AS answer ON answer.QuestionId = question.Id;

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我明白这是不对的，但我想不出还有别的。请帮忙

这不是创建表，而是加入

var commandStr= "If not exists (select name from sysobjects where name = 'Customer') CREATE TABLE Customer(First_Name char(50),Last_Name char(50),Address char(50),City char(50),Country char(25),Birth_Date datetime)";

使用SqlCommand=newsqlcommandstr，con command.ExecuteNonQuery

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您需要这样的“我最喜欢的相关子查询”来获取计数：

CREATE VIEW [dbo].[Question]
AS
SELECT (select COUNT(*) from Answers
        where QuestionId = question.Id) as 'Answers',
       question.Id,
       question.CreatorId,
       question.Title,
       question.Content,
       question.CreationDate
FROM Questions AS question;

或者，通过以下方式加入一个组：

CREATE VIEW [dbo].[Question]
AS
SELECT COUNT(answer.Id) as 'Answers',
       question.Id,
       question.CreatorId,
       question.Title,
       question.Content,
       question.CreationDate
FROM Questions AS question 
JOIN Answers AS answer
ON  answer.QuestionId = question.Id
GROUP BY question.Id,
         question.CreatorId,
         question.Title,
         question.Content,
         question.CreationDate;

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请注意，选择列表中的列要么是聚合函数的参数，要么也在GROUP BY子句中列出。

如果要计算所有条目，可以使用以下方法：

CREATE VIEW [dbo].[Question] AS
SELECT COUNT(*) AS amount FROM Questions

如果需要更复杂的计数或其他聚合函数，请查看该页面：

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粘贴答案时出现错误的选项卡/窗口？效果很好！！谢谢从我添加到问题中的代码中，你可以看到我阅读并理解了这一部分，我知道计数是如何工作的，你提出的站点很棒，但没有答案。