CREATE TABLE DEPT(deptno VARCHAR(10) PRIMARY KEY,dept_name CHAR(20));

 INSERT INTO DEPT VALUES(101,'TECHNICAL');
 INSERT INTO DEPT VALUES(102,'HEALTH');
 INSERT INTO DEPT VALUES(103,'FINANCIAL');
 INSERT INTO DEPT VALUES(104,'MANAGEMENT');
 INSERT INTO DEPT VALUES(105,'HR');

SELECT * FROM DEPT;



 CREATE TABLE SALESMAN(sno INT PRIMARY KEY,deptno VARCHAR REFERENCES DEPT(deptno) ON UPDATE CASCADE ON DELETE CASCADE,s_name CHAR(20),start_year INT);
 INSERT INTO SALESMAN VALUES(201,101,'DIVYA',2022);
 INSERT INTO SALESMAN VALUES(202,102,'SHRADDHA',2022);
 INSERT INTO SALESMAN VALUES(203,103,'BHAKTI',2022);
 INSERT INTO SALESMAN VALUES(204,104,'ABC',2019);
 INSERT INTO SALESMAN VALUES(205,105,'XYZ',2018);
 
 SELECT * FROM SALESMAN;
 
 
 CREATE TABLE EXPENSE(eid INT PRIMARY KEY,amount MONEY);
 
 INSERT INTO EXPENSE VALUES(401,25000);
 INSERT INTO EXPENSE VALUES(402,45000);
INSERT INTO EXPENSE VALUES(403,40000);
 INSERT INTO EXPENSE VALUES(404,70000);
 INSERT INTO EXPENSE VALUES(405,30000);
 
 SELECT * FROM EXPENSE;
 
 CREATE TABLE TRIP(tno INT PRIMARY KEY,sno INT REFERENCES SALESMAN(sno) ON UPDATE CASCADE ON DELETE CASCADE,eid INT REFERENCES EXPENSE(eid) ON UPDATE CASCADE ON DELETE CASCADE,from_city CHAR(20),to_city CHAR(20),departure_date DATE,return DATE);
 
 
 INSERT INTO TRIP VALUES(301,201,401,'PUNE','MUMBAI','2022-09-19','2019-12-25');
 INSERT INTO TRIP VALUES(302,202,402,'PUNE','MAHABALESHWAR','2022-10-29','2022-11-5');
 INSERT INTO TRIP VALUES(303,203,403,'PUNE','OOTY','2022-11-6','2022-11-15');
INSERT INTO TRIP VALUES(304,204,404,'MUMBAI','PUNE','2019-12-25','2020-11-25');
INSERT INTO TRIP VALUES(305,205,405,'LONAVALA','PUNE','2023-11-6','2023-11-15');

SELECT * FROM TRIP;


 CREATE OR REPLACE FUNCTION Q1() RETURNS VOID AS' DECLARE tn INT; fcity VARCHAR(20); tcity VARCHAR(20); BEGIN SELECT TRIP.tno, from_city, to_city INTO tn, fcity, tcity FROM TRIP, EXPENSE WHERE TRIP.eid=EXPENSE.eid AND amount=(SELECT MAX(amount) FROM EXPENSE); RAISE NOTICE ''tno = % , from_city = % , to_city = %'',tn, fcity, tcity; END; 'LANGUAGE'plpgsql';

select Q1();



 CREATE OR REPLACE FUNCTION Q4() RETURNS VOID AS' DECLARE tn INT; fcity VARCHAR(20); tcity VARCHAR(20); ddate DATE; rdate DATE; amt MONEY; BEGIN SELECT TRIP.tno, from_city, to_city, departure_date, return, amount INTO tn, fcity, tcity, ddate, rdate,amt FROM SALESMAN, DEPT, TRIP, EXPENSE WHERE SALESMAN.deptno=DEPT.deptno AND SALESMAN.sno=TRIP.sno AND TRIP.eid=EXPENSE.eid AND DEPT.dept_name=''HR''; RAISE NOTICE ''tno = % , from_city = % , to_city = % , departure = % , return = % , amount = % '', tn, fcity, tcity, ddate, rdate, amt; END; 'LANGUAGE'plpgsql';
select Q4();




create or replace function  f1() returns void as' declare trip_cur cursor is select 
tno, from_city,to_city,departure_date,TRIP.eid,amount from TRIP, EXPENSE WHERE TRIP.eid
=EXPENSE.eid and to_city="MUMBAI"; trip_rec TRIP%rowtype; begin open
trip_cur; loop fetch trip_cur into trip_rec; exit when not found; raise notice''tno= %%,
from_city=%,to_city=%,departure_date=%,return=%,amount=%'',trip_rec.tno,trip_rec.
from_city,trip_rec.to_city.trip_rec.departure_date,trip_rec.return,trip_rec.amount;
end loop;end;'LANGUAGE'plpgsql';

Select f1();
by

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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;