Question

hie all,
i want to insert the data into the table only if the table is empty, so for that i need to check the condition to check whether data already exists in the table, if present then i want to empty the table before inserting the the fresh value.
i know how to insert and delete the data only prob is to check the condition. so please can any help me out in this.

TO INSERT

Dim comUserSelect As OleDbCommand

        myDateTime(i) = DateTime.Parse(arr_dateTime(i))
        '  Console.WriteLine(r("P1"))
        Dim strSELEsCTa As Integer = r("P1")
        If ins < 10 Then
            ins = ins + 1

            Dim strSELECTa As String = "insert into tblvalues (DataTime ,P1) values ('" & DateTime.Parse(arr_dateTime(i)) & "','" & strSELEsCTa & "')"

            Dim dadte_s As New OleDbDataAdapter(strSELECTa, conn)
            comUserSelect = New OleDbCommand(strSELECTa, conn)

            comUserSelect.ExecuteNonQuery()
        End If

*TO DELETE *

 Dim strDelete As String = "delete * from tblvalues "

now i don know how to check the condition

Answer 1

"SELECT COUNT(*) FROM your_table_name"

If the table is empty, this should return 0.

Alternatively, you could try to select a row from the table and based on the response act upon it.

"SELECT * FROM your_table_name LIMIT 0, 1"