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POSQL Syntax to get AGPA
 

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    <p>Hi I have three tables as the following</p> <p><img src="https://i.stack.imgur.com/GZV5A.jpg" alt="enter image description here"></p> <p>I want to get the AGPA for the courses that the user passed</p> <p><img src="https://i.stack.imgur.com/p10XF.png" alt="enter image description here"></p> <p>I used this SQL syntax</p> <pre><code>string queryString = "select R.mark, c.NumberOfCredits from Courses c, RegisteredIn R where R.CourseId=c.id and R.StudentId=StudentId and R.mark &gt; 60 R.mark themark,c.NumberOfCredits credit select (sum(themark*credit)/sum(credit))*0.04 AGPA "; </code></pre> <p>and I did this to print out the results</p> <pre><code>using (SqlConnection connection = new SqlConnection(connectionString)){ SqlCommand command = new SqlCommand(queryString, connection); connection.Open(); System.Data.SqlClient.SqlDataReader reader = command.ExecuteReader(); reader.Read(); result = string.Empty; _AGPA = reader[3].ToString(); result += string.Format("Your GPA : {0} &lt;/br&gt; ",_AGPA); Response.Write(result); reader.Close(); } </code></pre> <p>Im pretty sure the SQL syntax is wrong Im getting this error</p> <p><img src="https://i.stack.imgur.com/685RG.jpg" alt="enter image description here"></p> <p>kindly advise how to solve it and where I did a mistake.</p> <p>Thank you</p> <hr> <p>Update :</p> <p>The Data Types are as the follwoing &amp; Im using SQL Server database <img src="https://i.stack.imgur.com/7NV1A.png" alt="enter image description here"></p> <hr> <p>Update 2 :</p> <p>the StudentId is passed through the URL of the page as the following</p> <pre><code>http://localhost:3401/MobileWebWIthConnection/showagpa.aspx?StudentId=20111 </code></pre> <p>and in the code I read it </p> <pre><code>string StudentId = Request.Params["StudentId"]; </code></pre>
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