create table branch
(
branchname varchar(20) primary key,
branchcity varchar(20),
assets int
);


create table account
(
accno int primary key,
branchname varchar(20),
balance int,
foreign key (branchname) references branch (branchname)
);



create table customer
(
customername varchar(20) primary key,
customerstreet varchar(20),
customercity varchar(20)

);



create table depositor
(
customername varchar(20),
accno int,
primary key(customername,accno),
foreign key(customername) references customer(customername),
foreign key(accno) references account(accno) on delete cascade
);



create table loan
(
loanno int,
branchname varchar(20),
amount real,
primary key(loanno),
foreign key(branchname) references branch(branchname)
);



create table borrower
(
customername varchar(20),
loanno int,
primary key(customername,loanno),
foreign key(customername) references customer(customername),
foreign key(loanno) references loan(loanno)
);

insert into branch values("basavanagudi","bangalore",25000000);
insert into branch values("greenpark","NewDelhi", 50000000);
insert into branch values("jayanagar", "bangalore", 50000000);
insert into branch values("marinadrive", "mumbai", 55000000);
insert into branch values("Noida", "NewDelhi", 35000000);



insert into account values( 105, "jayanagar",45000);
insert into account values( 205, "jayanagar",50000);
insert into account values( 250, "basavanagudi",40000);
insert into account values( 450, "basavanagudi",20000);
insert into account values( 458, "noida",25000);
insert into account values( 780, "greenpark",40000);
insert into account values( 900, "marinadrive",100000);


insert into customer values("john","noida","newdelhi");
insert into customer values("kumar","basavanagudi","bangalore");
insert into customer values("raju","jayanagar","bangalore");
insert into customer values("smith","highhills","newdelhi");
insert into customer values("sujal","kuvempu","bangalore");




insert into depositor values("john",105);
insert into depositor values("john",250);
insert into depositor values("kumar",250);
insert into depositor values("kumar",450);
insert into depositor values("raju",458);
insert into depositor values("smith",780);
insert into depositor values("sujal",900);







insert into loan values( 1002, "jayanagar" ,255000);
insert into loan values( 1003, "basavanagudi",555000);
insert into loan values( 1004, "noida",500000);
insert into loan values( 1005, "marinadrive",400000);
insert into loan values( 1006, "greenpark",600000);










insert into borrower values("john",1002);
insert into borrower values("kumar",1003);
insert into borrower values("raju",1004);
insert into borrower values("smith",1005);
insert into borrower values("sujal",1006);

3rd Query:

select d.customername from depositor d,account a where d.accno=a.accno group by d.customername having count(d.customername)>=2;




4th Query:

            create view cityb as (select branchname from branch where branchcity="bangalore");


            select distinct d.customername from depositor d, account a, cityb c where d.accno=a.accno and a.branchname=c.branchname group by d.accno;


5th query:


            delete from account where branchname in (select b.branchname from branch b where b.branchcity="bangalore");






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

$conn = new mysqli($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.customername from depositor d,account a where d.accno=a.accno group by d.customername having count(d.customername)>=2;<br><br>";

        $sqlQuery = "select d.customername from depositor d,account a where d.accno=a.accno group by d.customername having count(d.customername)>=2;";
        $result = $conn->query($sqlQuery);
        if($result->num_rows > 0)
        {
        echo "<table align=\"center\"border=10><tr><th>Customer Name</th>";
        echo "</tr>";
                while($row = $result->fetch_assoc())
                {
                         echo"<tr>";
                         echo "<td>$row[customername]</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.customername,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.customername having count(distinct b.branchname)=(select count(distinct b.branchname) from branch b where b.branchcity='bangalore');<br><br>";

$sqlQuery = "select d.customername,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.customername having count(distinct b.branchname)=(select count(distinct b.branchname) from branch b where b.branchcity='bangalore')";
        $result = $conn->query($sqlQuery);
        if($result->num_rows > 0)
        {
        echo "<table align=\"center\"border=10><tr><th>Customer Name</th>";
        echo "<th>Count branchname</th>";
        echo "</tr>";
                while($row = $result->fetch_assoc())
                {
                         echo"<tr>";
                         echo "<td>$row[customername]</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 branchname in(select branchname from branch where branchcity='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();
?>