db3

.<?php
$servername = "localhost";
$username = "root";
$password = "jit123";
$dbname = "db5";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error)
{
        die("connection failed: " . $conn->connect_error);
}
else
{
        echo"<p align=\"center\"><b>1.Find all customers who have atleast 2 accounts at the main branch<br><br></b>";

        echo"<p align=\"center\"><b>QUERY :</b> select d.cname from depositor d,account a where d.accno=a.accno group by d.cname having count(d.cname)>=2;<br><br>";

        $sqlQuery = "select d.cname from depositor d,account a where d.accno=a.accno group by d.cname having count(d.cname)>=2;";
        $result = $conn->query($sqlQuery);
        if($result->num_rows > 0)
        {
        echo "<table align=\"center\"border=10><tr><th>CName</th>";
        echo "</tr>";
                while($row = $result->fetch_assoc())
                {
                         echo"<tr>";
                         echo "<td>$row[cname]</td>";
                          echo "</tr>";
                }
                echo "</table><br><br><br>";
        }
        else
                echo"Empty set";


echo "<b><p align=\"center\">2.Find all customers who have an account at all the branches located in a specific city.<br><br></b>";

echo "<p align=\"center\"><b>QUERY :</b> select d.cname,count(distinct b.branchname) from account a,depositor d,branch b where a.accno=d.accno and b.branchname=a.branchname and b.branchcity='bangalore' group by d.cname having count(distinct b.branchname)=(select count(distinct b.branchname) from branch b where b.branchcity='bangalore');<br><br>";

$sqlQuery = "select d.cname,count(distinct b.branchname) as cnt from account a,depositor d,branch b where a.accno=d.accno and b.branchname=a.branchname and b.branchcity='bangalore' group by d.cname having count(distinct b.branchname)=(select count(distinct b.branchname) from branch b where b.branchcity='bangalore')";
        $result = $conn->query($sqlQuery);
        if($result->num_rows > 0)
        {
        echo "<table align=\"center\"border=10><tr><th>CName</th>";
        echo "<th>Count branchname</th>";
        echo "</tr>";
                while($row = $result->fetch_assoc())
                {
                         echo"<tr>";
                         echo "<td>$row[cname]</td>";
                        echo"<td>$row[cnt]</td>";
                          echo "</tr>";
                }
                echo "</table><br><br><br>";
        }
        else
                echo"Empty set";


                $sqlQuery="delete from account where bname in(select bname from branch where bcity='mumbai')";
    $result=$conn->query($sqlQuery);

echo "<p align=\"center\"><b>3.Demonstrate how you delete all account tuples at ever branch located in a specific city<br><br><br></b>";

    echo "<p align=\"center\"><b>QUERY :</b>delete from account where bname in(select bname from branch where bcity='mumbai')<br><br></b>";

    $sqlQuery="select * from account";
    $result=$conn->query($sqlQuery);

     if($result->num_rows > 0)
        {
        echo "<table align=\"center\"border=10><tr><th>Account Number</th>";
        echo "<th>Branch Name</th>";
        echo "<th>Balance</th>";
        echo "</tr>";
                while($row = $result->fetch_assoc())
                {
                         echo"<tr>";
                         echo "<td>$row[accno]</td>";
                        echo"<td>$row[branchname]</td>";
                         echo"<td>$row[balance]</td>";
                          echo "</tr>";
                }
                echo "</table>";
        }
        else
                echo"Empty set";
}
$conn->close();
?>