SubQuery
A Subquery or Inner query or Nested query is a query within another SQL query and embedded within the WHERE clause.
Subqueries can be used with the SELECT, INSERT, UPDATE, and DELETE statements along with the operators like =, <, >, >=, <=, IN, BETWEEN etc.
DEMO
HTML CODING
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="txtCountry" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Search" />
<table><tr><td></td><td> <asp:GridView ID="GridView1" runat="server">
<AlternatingRowStyle BackColor="#9999FF" />
<HeaderStyle BackColor="#FF3300" />
<RowStyle BackColor="#FF99FF" />
</asp:GridView>
</td></tr></table>
</div>
</form>
</body>
</html>
C# CODING
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
public partial class Default3 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["dbcon"].ToString());
con.Open();
SqlCommand cmd = new SqlCommand
("select * from country where country in (select country from register where country='"+txtCountry.Text+"')",con);
SqlDataAdapter adp = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
adp.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
}
}
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