How to perform an SQL query based on two tables!

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Basically, i have to perform a search where i want to show all the upcoming events for a member on a datagrid.

The hard part is that, the SpecialMoment table is where all the events are, including the MomentDateTime (which is where i was going to do >= GETDATE() to show all events upcoming from the current date). But another hard part is that the MemberMomentNo number is in the MemberMoment table.

Basically i want to show this in the grid:

MomentName, MomentDateTime - All in the SpecialMoment table
MemberID, MemberMomentNo - All in the MemberMoment table.

Im basically combing a searching through 2 tables.

I need help thanks

Posted 26-Feb-14 11:22am

Chris_Burns

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Maciej Los 26-Feb-14 17:40pm

What have you done till now? Where are you stuck? Improve your question and add details, at least: the structure of tables, sample data and expected output.

ZurdoDev 26-Feb-14 19:43pm

Where are you stuck? It's just a simple join if there is a relationship between the 2 tables.

[no name] 26-Feb-14 19:47pm

I'm not sure, its really difficult to explain. I thought it would be a simple join, but wouldnt that cause problems when trying to to the SQL statement in an SQLCommand in C#?

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Peter Leow · Answer 1 · 2014-02-26T15:46:00

Let spell out the scenario:
2 tables:
table: membermember, at least 2 fields: memberid, membermomentno, ...
table: moment, at least 2 fields: momentno, momentname, ...
membermomentno field is linked to momentno
Say you want to draw data from this 2 tables and populate a datagrid. Adapt the following code to suit your needs:
on the aspx page:

XML

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default8.aspx.cs" Inherits="Default8" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
   <ASP:DataGrid id="MyDataGrid" runat="server"
      Width="800"
      BackColor="#cccccc"
      BorderColor="black"
      ShowFooter="false"
      CellPadding="5"
      CellSpacing="5"
      Font-Name="Verdana"
      Font-Size="12pt"
      HeaderStyle-BackColor="#abcdef"
      EnableViewState="false"
   />
    </div>
    </form>
</body>
</html>

on the code behind:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;

public partial class Default8 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        SqlConnection myConnection = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename='C:\Users\Peter Leow\Documents\Visual Studio 2010\Projects\SampleDatabaseWalkthrough\SampleDatabaseWalkthrough\SampleDatabase.mdf';Integrated Security=True;Connect Timeout=30;User Instance=True");
        SqlDataAdapter myCommand = new SqlDataAdapter("SELECT memberid, momentname FROM membermoment JOIN moment ON membermomentno = momentno", myConnection);
        DataSet ds = new DataSet();
        myCommand.Fill(ds);
        DataView source = new DataView(ds.Tables[0]);
        MyDataGrid.DataSource = source;
        MyDataGrid.DataBind();
    }
}