create table bank_customer(accno varchar(10) primary key,cust_name varchar(10),place varchar(15));
create table deposit(accno varchar(10) constraint fk_acno references bank_customer,deposit_no varchar(5),damount numeric(6));
create table loan(accno varchar(10) constraint fk_lon references bank_customer,loan_no varchar(5),lamount numeric(6));

select *from bank_customer;
\d bank_customer;
insert into bank_customer values('a001','afsal','valanchery');
insert into bank_customer values('a002','fasil','pnk');
insert into bank_customer values('a003','shuhaib','tirur');
insert into bank_customer values('a004','sabir','tirur');
insert into bank_customer values('a005','afi','khidmath');


insert into deposit values('a001','d001','10000');
insert into deposit values('a002','d002','200000');
insert into deposit values('a003','d003','5000');
insert into loan values('a001','l001','50000');
insert into loan values('a004','l002','5000');

select *from bank_customer;
select *from deposit;
select *from loan;

select bank_customer.accno,cust_name,place,deposit_no,damount from bank_customer,deposit 
where bank_customer.accno=deposit.accno and bank_customer.accno not in (select accno from loan);
select bank_customer.accno,cust_name,place,loan_no,lamount from bank_customer,loan 
where bank_customer.accno=loan.accno and bank_customer.accno not in (select accno from deposit);



select cust_name from bank_customer 
where accno not in(select accno from deposit)and accno not in(select accno from loan);

select bank_customer.accno,cust_name,place,deposit_no,damount,loan_no,lamount from bank_customer,loan,deposit 
where bank_customer.accno=deposit.accno and bank_customer.accno=loan.accno;

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;