 /*

Language psql

*/


/*

Create the following database in 3NF using PostgresSQL. [Total Marks: 10]

Consider the following Bank database which maintains information about its branches, customers and 

their loan applications.
Branch (Bid integer, brname varchar (30), brcity varchar (10))
Customer (Cno integer, cname varchar (20), caddr varchar (35), city varchar (15))
Loan_application (Lno integer, l_amt_required money, lamtapproved money, l_date date)
Relationship:
Branch, Customer, Loan_application are related with ternary relationship as follows:
Ternary (Bid, Cno, Lno )
Constraints: Primary key, l_amt_required should be greater than zero.

*/


Create Table Branch (
  Bid integer Primary Key,
  brname varchar,
  brcity varchar
);

Create Table Customer(
  Cno integer Primary Key,
  cname varchar, 
  caddr varchar,
  city varchar
);

Create Table Loan_application(
  Lno integer Primary Key,
  l_amt_required money,
  l_amt_approved money,
  l_date date
);

Create Table Ternary(
  Bid integer references Branch(Bid),
  Cno integer references Customer(Cno),
  Lno integer references Loan_application(Lno)
);

Insert Into Branch Values (1,'Shivaji Nagar','Nashik');
Insert Into Branch Values (2,'Satpur','Nashik');
Insert Into Branch Values (3,'Pimpri','Pune');
Insert Into Branch Values (4,'Indira Nagar','Pune');

Insert Into Customer Values(1,'Ajay','Satpur','Niphad');
Insert Into Customer Values(2,'Vijay','Shivaji Nagar','Nashik');
Insert Into Customer Values(3,'Yash','Indira Nagar','Pune');
Insert Into Customer Values(4,'Shubham','Vidya Circle','Pune');

Insert Into Loan_application Values(1,'45000','45000','12/25/2022');
Insert Into Loan_application Values(2,'500000','45000','11/26/2021');
Insert Into Loan_application Values(3,'45000','45000','10/27/2020');
Insert Into Loan_application Values(4,'45000','45000','9/28/2019');

Insert Into Ternary Values(1,1,1);
Insert Into Ternary Values(2,2,2);
Insert Into Ternary Values(3,3,3);
Insert Into Ternary Values(3,3,3);


/*
Create Or Replace Function Insertion() 
Returns Void As'
Declare
  b int := 1;
  c int := 1;
  l int := 1;
Begin
  while(b<=4) loop
    while(c<=4) loop
      while(l<=4) loop
        Insert Into Ternary Values(b,c,l);
        l := l+1;
      end loop;
      l := 1;
      c := c+1;
    end loop;
    c := 1;
    b := b+1;
  end loop;
END;'
language 'plpgsql';

Select Insertion();
*/



Select * From Branch;
Select * From Customer;
Select * From Loan_application;
Select * From Ternary;

/*
Create a View: 

1. To display customer details who have applied for a loan of 5, 00,000.

2. To display loan details from the ‘Aundh’ branch.

*/

Create View C_Details as Select * from Customer where Cno IN (
Select Cno From Ternary Where Lno IN (
Select Lno From Loan_application Where l_amt_required = '500000'));

Select * From C_Details;

created 2 years ago

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About PostgreSQL

PostgreSQL is a open source relational database system and is also knows as Postgres.

Key Features:

Postgres is not only free and open-source but also it is highly extensible.
Custom Data types and funtions from various programming languaues can be introduced and the good part is compiling entire database is not required.
ACID(Atomicity, Consistency, Isolation, Durability) compliant.
First DBMS which implemented Multi-version concurrency control (MVCC) feature.
It's the default database server for MacOS.
It supports all major operating systems like Linux, Windows, OpenBSD,FreeBSD etc.

Syntax help

1. CREATE

CREATE command is used to create a table, schema or an index.

Syntax:

         CREATE TABLE table_name (
                column1 datatype,
                column2 datatype,
                ....);

2. ALTER

ALTER command is used to add, modify or delete columns or constraints from the database table.

Syntax

ALTER TABLE Table_name ADD column_name datatype;

3. TRUNCATE:

TRUNCATE command is used to delete the data present in the table but this will not delete the table.

Syntax

TRUNCATE table table_name;

4. DROP

DROP command is used to delete the table along with its data.

Syntax

DROP TABLE table_name;

5. RENAME

RENAME command is used to rename the table name.

Syntax

ALTER TABLE table_name1 RENAME to new_table_name1;

6. INSERT

INSERT Statement is used to insert new records into the database table.

Syntax

INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);

7. SELECT

Select statement is used to select data from database tables.

Syntax:

SELECT column1, column2, ...
FROM table_name;

8. UPDATE

UPDATE statement is used to modify the existing values of records present in the database table.

Syntax

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

9. DELETE

DELETE statement is used to delete the existing records present in the database table.

Syntax

DELETE FROM table_name where condition;