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README.md

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+Project Name : Newspaper Management System
+DDL,DML and PL-SQL files are uploaded separately
+
+Submitted By:
+Irhamul Islam
+1907093
+Year:3rd Semester:1st
+
+Assalamualaikum Sir,Please note that my Username was 'gg93a' when I have uploaded the files.It was changed to 'irham1907093' later on 2 June,2023. 

ddl-1907093.sql

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+--dropping existing tables
+
+
+drop table feedback;
+drop table subscribers;
+drop table news;
+drop table topic;
+drop table journalist;
+
+--creating table
+
+create table topic(
+ topic_id int,
+title varchar(20),
+primary key(topic_id)
+);
+
+create table journalist(
+	j_id int,
+	j_name varchar(20),
+	primary key(j_id)
+);
+
+create table news(
+	news_id int,
+	description varchar(50),
+	n_date date,
+	topic_id int,
+	j_id int,
+	primary key(news_id),
+	foreign key(topic_id) references topic(topic_id),
+	foreign key(j_id) references journalist(j_id)
+);
+
+create table subscribers(
+	sub_id int,
+	sub_name varchar(20),
+	sub_age int,
+	sub_type varchar(20),
+	primary key(sub_id)
+);
+
+create table feedback(
+	news_id int,
+	sub_id int,
+	reaction varchar(20),
+	comments varchar(20),
+	primary key(news_id,sub_id),
+	foreign key(news_id) references news(news_id) on delete cascade,
+	foreign key(sub_id) references subscribers(sub_id) on delete cascade
+);
+
+--adding column in table
+
+alter table topic add category char(50);
+
+--modify column in table
+
+alter table topic modify category varchar(20);
+
+--rename column in table
+
+alter table topic rename column category to genre;
+
+--drop column from table
+
+alter table topic drop column genre;

dml-1907093.sql

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+set linesize 1000
+set pagesize 400
+
+--inserting values in table
+
+insert into topic(topic_id,title) values(11,'politics');
+insert into topic(topic_id,title) values(12,'business');
+insert into topic(topic_id,title) values(13,'international');
+insert into topic(topic_id,title) values(14,'economics');
+insert into topic(topic_id,title) values(15,'sports');
+insert into topic(topic_id,title) values(16,'entertainment');
+insert into topic(topic_id,title) values(17,'environment');
+insert into topic(topic_id,title) values(18,'education');
+insert into topic(topic_id,title) values(19,'agriculture');
+insert into topic(topic_id,title) values(20,'economics'); 
+
+insert into journalist(j_id,j_name) values(101,'raya bacchan');
+insert into journalist(j_id,j_name) values(102,'akbar hossain');
+insert into journalist(j_id,j_name) values(103,'angkita biswas');
+insert into journalist(j_id,j_name) values(104,'rahat mollick');
+insert into journalist(j_id,j_name) values(105,'ahnaf saber');
+insert into journalist(j_id,j_name) values(106,'nihal mojumder');
+insert into journalist(j_id,j_name) values(107,'james anderson');
+insert into journalist(j_id,j_name) values(108,'zamshed islam');
+insert into journalist(j_id,j_name) values(109,'dibbo dey');
+insert into journalist(j_id,j_name) values(110,'sakif zawad');
+
+insert into news(news_id,description,n_date,topic_id,j_id) values (1,'a','21-dec-25',11,101);
+insert into news(news_id,description,n_date,topic_id,j_id) values(2,'b','22-feb-17',12,102);
+insert into news(news_id,description,n_date,topic_id,j_id) values(3,'c','24-mar-27',12,103);
+insert into news(news_id,description,n_date,topic_id,j_id) values(4,'d','22-nov-23',16,104);
+insert into news(news_id,description,n_date,topic_id,j_id) values(5,'e','11-feb-12',18,105);
+insert into news(news_id,description,n_date,topic_id,j_id) values(6,'f','11-oct-29',19,106);
+insert into news(news_id,description,n_date,topic_id,j_id) values(7,'g','27-jul-15',14,107);
+insert into news(news_id,description,n_date,topic_id,j_id) values(8,'f','22-jan-12',15,108);
+insert into news(news_id,description,n_date,topic_id,j_id) values(9,'i','14-jan-16',16,109);
+insert into news(news_id,description,n_date,topic_id,j_id) values(10,'j','18-jan-27',16,110);
+
+
+insert into  subscribers (sub_id,sub_name,sub_age,sub_type) values(51,'aboni',17,'child');
+insert into  subscribers (sub_id,sub_name,sub_age,sub_type)  values(52,'sami',24,'adult');
+insert into  subscribers (sub_id,sub_name,sub_age,sub_type)  values(53,'zakaria',21,'adult');
+insert into  subscribers (sub_id,sub_name,sub_age,sub_type)  values(54,'rafi',25,'adult');
+insert into  subscribers (sub_id,sub_name,sub_age,sub_type)  values(55,'mahatab',34,'adult');
+insert into  subscribers (sub_id,sub_name,sub_age,sub_type)  values(56,'miraj',51,'adult');
+insert into  subscribers (sub_id,sub_name,sub_age,sub_type)  values(57,'nazmul',62,'senior citizen');
+insert into  subscribers (sub_id,sub_name,sub_age,sub_type)  values(58,'rokon',68,'senior citizen');
+insert into  subscribers (sub_id,sub_name,sub_age,sub_type)  values(59,'sara',27,'adult');
+insert into  subscribers (sub_id,sub_name,sub_age,sub_type)  values(60,'simi',22,'adult');
+
+insert into feedback (news_id,sub_id,reaction,comments) values(1,51,'like','good');
+insert into feedback (news_id,sub_id,reaction,comments) values(2,52,'love','impressive');
+insert into feedback (news_id,sub_id,reaction,comments) values(3,53,'love','good');
+insert into feedback (news_id,sub_id,reaction,comments) values(4,54,'like','good');
+insert into feedback (news_id,sub_id,reaction,comments) values(5,55,'dislike','bad');
+insert into feedback (news_id,sub_id,reaction,comments) values(6,56,'dislike','bad');
+insert into feedback (news_id,sub_id,reaction,comments) values(7,57,'angry','very unpleasent');
+insert into feedback (news_id,sub_id,reaction,comments) values(8,58,'love','praise worthy');
+insert into feedback (news_id,sub_id,reaction,comments) values(9,59,'like','amazing');
+insert into feedback (news_id,sub_id,reaction,comments) values(10,60,'angry','good');
+
+--displaying data of table using select
+
+select *from subscribers where sub_name='simi';
+select *from news where news_id=1;
+
+--updating data in table
+
+--changing subscribers name
+update subscribers set sub_name='natasha' where sub_id=53;
+--changing journalist name
+update journalist set j_name='anshul chauhan' where j_id=102;
+
+
+--deleting row from table
+
+delete from feedback where news_id=10;
+--to check if it's working
+select *from feedback;
+--inserting this again
+insert into feedback (news_id,sub_id,reaction,comments) values(10,60,'angry','good');
+
+
+--UNION
+
+--SHOWING THE NAME OF THE JOURNALISTS WHOSE NAME STARTS WITH a OR HAS M IN IT
+select j_name from journalist where j_name like 'a%' union select j_name from journalist where j_name like '%m%'; 
+
+--INTERSECT
+
+--SHOWING THE NAME OF THE JOURNALISTS WHOSE NAME ENDS WITH 'N' AND HAS 'A' IN THE NAME
+select j_name from journalist where j_name like '%n' intersect select j_name from journalist where j_name like '%a%';
+
+--EXCEPT/MINUS
+
+--SHOWING THE NAME OF THE JOURNALISTS WHOSE NAME ENDS WITH 'N' BUT NO 'R' IN THE NAME
+select j_name from journalist where j_name like '%n' minus select j_name from journalist where j_name like '%r%';  
+
+
+--WITH CLAUSE
+
+--SHOWING INFO OF SUBSCRIBERS HAVING HIGHEST AGE USING WITH CLAUSE
+with maximum as (select max(sub_age) as max_age from subscribers)
+select * from subscribers,maximum where subscribers.sub_age=maximum.max_age;
+
+--AGGREGATE FUNCTION
+
+--TOTAL ROW IN TABLE
+select count(*) from topic;
+
+--TOTAL UNIQUE(NAME) JOURNALISTS IN NAME
+select count(distinct title) as titles from topic;
+
+--AVERAGE AGE OF SUBSCRIBERS TABLE
+select avg(sub_age) from subscribers;
+
+--SUM OF AGE IN SUBSCRIBERS TABLE
+
+select sum(sub_age) from subscribers;
+
+--MAXIMUM AGE OF SUBSCRIBERS TABLE
+select max(sub_age) from subscribers;
+
+--MINIMUM AGE OF SUBSCRIBERS TABLE
+select min(sub_age) from subscribers;
+
+--NESTED SUBQUERY
+
+--SHOWING TOPIC TITLE OF A JOURNALIST
+select title from topic where topic_id=(select topic_id from news where j_id=(select j_id from journalist where j_name='raya bacchan'));
+
+
+--SET MEMBERSHIP(IN,NOT IN)
+
+--SHOWING NAME OF TITLES HAVING 'S' IN THE END AND 'I' IN THE NAME
+select title from topic where title like '%s' and title in (select title from topic where title like '%i%');  
+select distinct(title) from topic where title like '%s' and title in (select title from topic where title like '%i%');  
+
+
+--SHOWING NAME OF TITLES HAVING 'S' IN THE END BUT NO 'I' IN THE NAME
+select title from topic where title like '%s' and title not in (select title from topic where title like '%i%');  
+select distinct(title) from topic where title like '%s' and title not in (select title from topic where title like '%i%'); 
+
+
+--SOME,ALL
+
+--SHOWING SUBSCRIBERS HAVING AGE HIGHER THANT AT LEAST ONE MEMBER WITH LEAST AGE 25
+select sub_name from subscribers where sub_age>some(select sub_age from subscribers where sub_age>=25);
+
+--SHOWING SUBSCRIBERS HAVING AGE HIGHER THANT AT ALL MEMBERS WITH LEAST AGE 25
+select sub_name from subscribers where sub_age>all(select sub_age from subscribers where sub_age>=25);
+
+--SHOWING SUBSCRIBERS HAVING AGE HIGHER OR EQUAL THAN ALL MEMBERS WITH LEAST AGE 25
+select sub_name from subscribers where sub_age>=all(select sub_age from subscribers where sub_age>=25);
+
+--EXISTS,NOT EXISTS
+
+--FINDING A TITLE WITH LETTER 'N' IF THERE IS TITLE WITH LETTER 'B'
+select title from topic where title like '%n%' and exists(select title from topic where title like '%b%');
+
+--FINDING A TITLE WITH LETTER 'N' IF THERE IS NO TITLE WITH LETTER 'P'
+select title from topic where title like '%n%' and not exists(select title from topic where title like '%p%');
+
+--STRING OPERATION
+
+--FINDING INFO OF JOURNALISTS ENDING 'R'
+select * from journalist where j_name like '%r';
+
+--FINDING INFO OF COMMENTS IN FEEDBACK WITH LENGTH 4
+select * from feedback where comments like '____';
+
+--JOIN OPERATION
+
+--NATURAL JOIN
+select * from topic natural join news where title='politics';  
+
+--join
+select * from topic join news on topic.title = 'politics' and topic.topic_id = news.topic_id;   
+
+--left outer,right outer,full join
+
+
+select title,n_date from topic left outer join news using(topic_id);
+select title,n_date from topic right outer join news using(topic_id);      
+select title,n_date from topic full outer join news using(topic_id);
+
+
+--CREATING A VIEW OF topic economics 
+
+drop view econ;
+create view econ as select * from topic natural join news where title='economics'; 
+select * from econ;
+
+--CREATING VIEW  using econ
+
+drop view ONETWO;
+create view ONETWO as select * from econ where title = 'economics'; 
+select * from ONETWO;
+
+
+
+