create table bank_customer(acc_no int primary key, cust_name varchar(10), place varchar(15));
create table deposit (acc_no int references bank_customer(acc_no), deposit_no int,damount int);
create table loan(acc_no int references bank_customer(acc_no), loan_no int, l_amount int);
insert into bank_customer values(12344,'Abin','Kannur');
insert into bank_customer values(12345,'Arun','Kozhikode');
insert into bank_customer values(12346,'Athira','Koyilandi');
insert into bank_customer values(12347,'Samuel','Manjeri');
insert into bank_customer values(12348,'Aparna','Aluva');
insert into bank_customer values(12349,'Kiran','Pattambi');
insert into deposit values(12345,100,25000);
insert into deposit values(12346,101,30000);
insert into deposit values(12347,102,300000);
insert into loan values(12345,200,70000);
insert into loan values(12348,201,65000);
insert into loan values(12349,202,35000);

select cust_name,damount from bank_customer,deposit where
bank_customer.acc_no=deposit.acc_no and
not exists(select * from loan where loan.acc_no=bank_customer.acc_no);
select cust_name,l_amount from bank_customer,loan where
bank_customer.acc_no=loan.acc_no and not
exists(select * from deposit where deposit.acc_no=bank_customer.acc_no);

select cust_name from bank_customer,deposit,loan where
bank_customer.acc_no=loan.acc_no and bank_customer.acc_no=deposit.acc_no;
select cust_name from bank_customer where acc_no not in(select acc_no from deposit union
select acc_no from loan);

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;