Aggregate functions on dataset in vb.net

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Hi,

Can we use aggregate functions on data set. For example, I have data of 10 subjects with each subject having more than 200 students data. Want to get subject wise number of students who scored more than 50 marks.

Something like

SQL

Select subject,count(*) from data_set("table1") where marks >=50 group by subject order by subject.

and result will be something like

C#

SUBJECT-1   20
SUBJECT-2   30
SUBJECT-3   44

and so on.

Can anyone give me similar syntax which works on data set?

Anand

Posted 23-Aug-13 19:25pm

Anand Rangaraju

Updated 23-Aug-13 20:22pm

ridoy

v4

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Rakesh Meel · Answer 1 · 2013-08-23T20:59:00

Solution 1

Belowing Code will help you......

Dim connection As SqlConnection = New sqlconnection()
connection.ConnectionString = "Your Connection String"
connection.Open()
Dim adp As SqlDataAdapter = New SqlDataAdapter("Select subject,count(*) from data_set("table1") where marks >=50 group by subject order by subject", connection)
Dim ds As DataSet = New DataSet()
adp.Fill(ds)
DataGridView1.DataSource = ds.Tables(0)

Posted 23-Aug-13 20:59pm

Rakesh Meel

Comments

Anand Rangaraju 24-Aug-13 8:44am

Thanks Mr.Rakesh for the reply. But, I guess you did not understand the question properly or I did not present properly. I will elaborate more on this.

After the data is acquired in the data set
wsql_query = "SELECT sub_code,marks from marks_table order by sub_code"
da = New OleDbDataAdapter(wsql_query, con)
ds = New DataSet
da.Fill(ds, "student_data")
Now, I want to run a query from the ds.tables("student_data") as below
SELECT SUB_CODE,COUNT(*) FROM DS.TABLES("STUDENT_DATA") WHERE MARKS>50 GROUP BY SUB_CODE

Hope I made it clear now.