create table branch(bid int primary key,brname char(30),brcity char(10));
\d branch;
create table customer(cno int primary key, cname char(20),caddar char(35),city char(20));
create table loan_application(lno int primary key,amount_required text,amount_approved_money text,l_date date);
\d customer;
\d loan_application;
create table ternary(bid int references branch,cno int references customer,lno int references loan_application);
\d ternary;
insert into branch values(1,'Aundh','pune');
insert into branch values(2,'M.G road','Nashik');
insert into branch values(3,'Sara','pune');
insert into branch values(4,'Camp','mumbai');
insert into branch values(5,'M.G road','mumbai');
select * from branch;
insert into customer values(101,'Rajesh','shaneevar peth','pune');
insert into customer values(102,'Mahesh','Ram nagar','pune');
insert into customer values(103,'suresh',' Rane nagar','Nashiik');
insert into customer values(104,'Rakesh','raveevar peth peth','mumbaii');
insert into customer values(105,'manoj','Mohan plaza','Nagpur');
select * from customer;

PostgreSQL online editor

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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;