diff --git a/DDL.sql b/DDL.sql
new file mode 100644
index 0000000..481947a
--- /dev/null
+++ b/DDL.sql
@@ -0,0 +1,163 @@
+show user
+select table_name from user_tables;
+
+drop table Admitted_Patients;
+drop table Appointment;
+drop table medical_history;
+drop table Patient;
+drop table Doctor;
+show linesize;
+show pagesize;
+set linesize 500;
+set pagesize 500;
+
+--DemoTables for showing on delete cascade
+
+create table Doctor
+  (
+  name varchar(10) not null,
+  id number primary key check (id>=0),
+  unit varchar(20) not null,
+  Constraint UnitIn check
+  (unit in ('burn','surgery')
+  )
+  );
+desc Doctor;
+alter table Doctor add experience varchar(10);
+alter table Doctor add age varchar(10);
+desc Doctor;
+alter table Doctor modify age number;
+desc Doctor;
+alter table Doctor modify age number check (age>=20 and age<=80);
+desc Doctor;
+alter table Doctor rename column id to doc_id;
+desc Doctor;
+alter table Doctor rename column doc_id to id;
+desc Doctor;
+alter table Doctor rename to DemoDoctor;
+desc DemoDoctor;
+alter table DemoDoctor rename to Doctor;
+desc Doctor;
+alter table Doctor drop column experience;
+desc Doctor;
+insert into Doctor values ('abc','1','burn','20');
+select * from Doctor;
+--does not satisfy constraint
+--insert into Doctor values (null,'1','burn','20');
+--insert into Doctor (id,unit,age) values ('2','burn','20');
+--insert into Doctor values ('abc','3','burn','10');
+--insert into Doctor values ('abc','3','Neurology','10');
+--select * from Doctor;
+
+create table admitted_patients
+  (doctor_id number PRIMARY KEY,
+   patient_name varchar(20),
+   foreign key (doctor_id) references Doctor (id)
+   on delete cascade);
+desc admitted_patients;
+
+insert into admitted_patients values ('1','abc');
+select * from admitted_patients;
+delete from Doctor where id=1;
+select * from Doctor;
+select * from admitted_patients;
+drop table admitted_patients;
+drop table Doctor;
+
+
+--Doctor
+create table Doctor
+(
+     doctor_id int,
+     doctor_name varchar(30) not null,
+     unit varchar(30) not null,
+     email varchar(30) unique not null,
+     phone_no varchar(15) unique not null,
+     primary key (doctor_id),
+     Constraint UnitIn check
+     (unit in ('burn','surgery','ICU','emergency medicine','NICU','neurology','nephrology',
+     'cardiology','orthopedics','psychiatry','pediatrics','oncology','CCU')
+     )
+);
+
+desc Doctor;
+
+
+--Patient
+create table Patient
+(
+patient_id int primary key,
+patient_name varchar(30) not null,
+email varchar(30) unique,
+phone_no varchar(15) unique not null,
+age number check(age>=0),
+gender varchar(2) not null
+);
+desc patient;
+
+--alter table
+alter table patient add gender1 varchar(2);
+desc patient;
+alter table patient modify gender1 number;
+desc patient;
+alter table patient rename column gender1 to gender2;
+desc patient;
+alter table patient drop column gender2;
+desc patient;
+
+
+--medical_history
+Create table medical_history
+(
+patient_id int not null ,
+condition varchar(50) not null,
+treatment_history varchar (50),
+foreign key (patient_id) references Patient
+);
+desc medical_history;
+
+
+--Admitted_Patients
+Create table Admitted_Patients
+(
+doctor_id int not null,
+patient_id int ,
+ward varchar(30) not null,
+condition varchar(50) not null,
+admit_date Date not null,
+release_date Date,
+primary key(patient_id),
+foreign key (doctor_id) references Doctor,
+foreign key (patient_id) references Patient (patient_id),
+CONSTRAINT duration CHECK
+(
+release_date>=admit_date
+),
+CONSTRAINT wardin CHECK
+(
+ward in ('burn','ICU','emergency medicine','NICU','nephrology',
+     'orthopedics','psychiatry','children','CCU')
+)
+);
+desc Admitted_Patients;
+
+
+--Appointment
+Create table Appointment
+(doctor_id int not null,
+patient_id int not null,
+Appointment_date Date not null,
+Appointment_time varchar(20) not null,
+primary key(doctor_id,patient_id),
+foreign key (doctor_id) references Doctor,
+foreign key (patient_id) references Patient
+);
+desc Appointment;
+
+
+
+
+
+
+
+
diff --git a/DML.sql b/DML.sql
new file mode 100644
index 0000000..bd6dcfe
--- /dev/null
+++ b/DML.sql
@@ -0,0 +1,340 @@
+--Doctor insert
+--insert delete update 
+insert into Doctor values('01','Dr Md. Mukitul Huda','burn','mukitulhuda@gmail.com','0123556');
+insert into Doctor values('02','Dr Mrinal Sarker','surgery','mrinalsarker@gmail.com','0168768');
+insert into Doctor values('03','Dr Liakat Hossain','ICU','liakathossain@gmail.com','0186876');
+insert into Doctor values('04','Dr Jibon nesa','emergency medicine','jibonnesa@gmail.com','0168769');
+insert into Doctor values('05','Dr Farruk Ahmed','NICU','farrukahmed@gmail.com','0187578');
+select * from Doctor;
+delete from doctor where doctor_id='05';
+select * from Doctor;
+update Doctor set doctor_name='Abc' where doctor_id='02';
+select * from doctor;
+--delete all rows
+delete from Doctor;
+select * from Doctor;
+
+
+--insertion
+insert into Doctor values('01','Dr Md. Mukitul Huda','burn','mukitulhuda@gmail.com','0123556');
+insert into Doctor values('02','Dr Mrinal Sarker','surgery','mrinalsarker@gmail.com','0168768');
+insert into Doctor values('03','Dr Liakat Hossain','emergency medicine','liakathossain@gmail.com','0186876');
+insert into Doctor values('04','Dr Jibon nesa','emergency medicine','jibonnesa@gmail.com','0168769');
+insert into Doctor values('05','Dr Farruk Ahmed','neurology','farrukahmed@gmail.com','0187578');
+insert into Doctor values('06','Dr Evana Nasrin','neurology','evananasrin@gmail.com','019868');
+insert into Doctor values('07','Dr Nabila Paul','nephrology','nabilapaul@gmail.com','979868');
+insert into Doctor values('08','Dr Md. Mukitul Huda','cardiology','mukitul@gmail.com','012355689');
+insert into Doctor values('09','Dr Nafisa Tasnim','orthopedics','tasnim@gmail.com','013724567234');
+insert into Doctor values('10','Dr Abir Hossain','cardiology','abir@gmail.com','018687676');
+insert into Doctor values('11','Dr Rhea','psychiatry','rhea@gmail.com','016876976');
+insert into Doctor values('12','Dr Niasa Ahmed','pediatrics','niasaahmed@gmail.com','01875788687');
+insert into Doctor values('13','Dr Nasrin','oncology','nasrin@gmail.com','0198688768');
+insert into Doctor values('14','Dr Paul','orthopedics','paul@gmail.com','015979868');
+insert into Doctor values('15','Dr Emon','burn','emon@gmail.com','01238987556');
+insert into Doctor values('16','Dr Mridha','burn','mridha@gmail.com','0168766578');
+insert into Doctor values('17','Dr Mukitul Huda','surgery','mukitulhuda1@gmail.com','012387556');
+insert into Doctor values('18','Dr Mrinal','surgery','mrinal@gmail.com','016875468');
+select * from Doctor;
+
+
+--Patient insert
+insert into Patient values ('101','Shimu','shimu@gmail.com','019865787661','23','F');
+insert into Patient values ('102','Sina','sina@gmail.com','019865787681','2','M');
+insert into Patient values ('103','Turjo','turjo@gmail.com','019865978761','23','M');
+insert into Patient values ('104','Sujoy Kundu','sujoy@gmail.com','01986579061','29','M');
+insert into Patient values ('105','Jesi','jesi@gmail.com','019865789061','13','F');
+insert into Patient values ('106','Disha',null,'019889789061','10','F');
+insert into Patient values ('107','Jesi',null,'01986578978','3','F');
+insert into Patient values ('108','Imran','imran@gmail.com','0198899061','13','M');
+insert into Patient values ('109','Naimur Rahman','naimurrahman@gmail.com','01986578761','23','M');
+insert into Patient values ('110','Borhan Ul Alif','borhan@gmail.com','01989078762','24','M');
+insert into Patient values ('111','Farhatun Shama','farhatunshama@gmail.com','01988663','20','F');
+insert into Patient values ('112','Rafia Shahrin','rafiashahrin@gmail.com','019877674','19','F');
+insert into Patient values ('113','Asadullah Galib','asadullahgalib@gmail.com','01998785','25','M');
+insert into Patient values ('114','Habibur',null,'01998778986','25','M');
+insert into Patient (patient_id,patient_name,phone_no,age,gender) values ('115','Sornaly','0199878907','20','F');
+insert into Patient values ('116','Talha','talha@gmail.com','01909898788','2','M');
+insert into Patient values ('117','Mashhura Mashfi','mashhuramashfi@gmail.com','019875569','15','F');
+insert into Patient values ('118','Proma','proma@gmail.com','019875095610','15','F');
+insert into Patient values ('119','Sabnaj Akhter','sabnajakter@gmail.com','019887611','23','F');
+insert into Patient values ('120','Nibir','nibir@gmail.com','019887612','23','M');
+insert into Patient values ('121','Ashfaq Mahmud','ashfaqmahmud@gmail.com','019870813','25','M');
+insert into Patient values ('122','Afiat Khan','afiatkhan@gmail.com','019878614','20','M');
+insert into Patient values ('123','Ankon','ankon@gmail.com','019878715','19','M');
+insert into Patient values ('124','Lamisa Deya','lamisadeya@gmail.com','019875616','15','F');
+insert into Patient values ('125','Arpita Kundu','arpitakundu@gmail.com','019357945217','12','F');
+insert into Patient values ('126','Faria Mimi','faria@gmail.com','019357945218','13','F');
+insert into Patient values ('127','Sumona','sumona@gmail.com','01935796717','12','F');
+insert into Patient values ('128','Roxsana','roxsana@gmail.com','019357945219','21','F');
+insert into Patient values ('129','Nabila','nabila@gmail.com','019357945220','43','F');
+insert into Patient values ('130','Nabila','nabila_N@gmail.com','019357945221','21','F');
+
+--does not satisfy primary key constraint/ integrity constraint
+--insert into Patient values ('129','sujoy','sujoy@gmail.com','019357220','43','M');
+--insert into Patient values ('131','Nabila','nabila@gmail.com','019357945220','43','F');
+
+insert into Patient values ('131','Shaoni','shaoni@gmail.com','019357941310','21','F');
+insert into Patient values ('132','Tara','tanha@gmail.com','0193578621','23','F');
+insert into Patient values ('133','Sara','sara@gmail.com','0193579671','21','F');
+select * from patient;
+
+--delete and update
+delete from Patient where patient_id=133;
+--the line below will display no rows selected
+select * from patient where patient_id=133;
+select * from patient where patient_id='106';
+update Patient set email='abc@gmail.com' where patient_id='106';
+select * from Patient where patient_id='106';
+select * from Patient where patient_name='Tara';
+update Patient set patient_name='Tanha' where patient_name='Tara';
+select * from Patient where patient_name='Tanha';
+
+
+--medical_history
+insert into medical_history (patient_id, condition,treatment_history) values ('101','fractured bone','Surgery');
+insert into medical_history (patient_id, condition,treatment_history) values ('102','Asthma','Medicine:inhaler');
+insert into medical_history (patient_id, condition,treatment_history) values ('103','Stroke','Neuro-Surgery');
+insert into medical_history (patient_id, condition,treatment_history) values ('103','Heart block','Bypass surgery');
+insert into medical_history (patient_id, condition,treatment_history) values ('102','Allergy',null);
+insert into medical_history (patient_id, condition,treatment_history) values ('104','Kidney damages','Dialysis');
+insert into medical_history (patient_id, condition,treatment_history) values ('105','Asthma','Steroid Medicines');
+insert into medical_history (patient_id, condition,treatment_history) values ('106','Stroke','Surgery');
+insert into medical_history (patient_id, condition,treatment_history) values ('107','Heart Attack','Bypass surgery');
+insert into medical_history (patient_id, condition,treatment_history) values ('110','Broken bone','Surgery');
+insert into medical_history (patient_id, condition) values ('113','Respiratory Difficulties');
+insert into medical_history (patient_id, condition) values ('123','sleeping Difficulties');
+insert into medical_history (patient_id, condition,treatment_history) values ('114','Broken bone','Surgery');
+insert into medical_history (patient_id, condition,treatment_history) values ('124','Heart attack','Bypass surgery');
+insert into medical_history (patient_id, condition,treatment_history) values ('115','First degree burn','Medicines');
+insert into medical_history (patient_id, condition,treatment_history) values ('116','Cholera','Vaccines');
+insert into medical_history (patient_id, condition,treatment_history) values ('119','Covid','Medicines');
+insert into medical_history (patient_id, condition,treatment_history) values ('119','Asthma','Medicines');
+insert into medical_history (patient_id, condition,treatment_history) values ('121','Heart attack','Bypass surgery');
+insert into medical_history (patient_id, condition,treatment_history) values ('125','Burn','Medicines');
+insert into medical_history (patient_id, condition,treatment_history) values ('126','joints pain','Medicine');
+insert into medical_history (patient_id, condition,treatment_history) values ('130','fractured bone','medicine');
+
+select *  from medical_history;
+select * from medical_history order by patient_id;
+
+
+
+--Admitted_Patients
+
+insert into Admitted_Patients values ('01','101','burn','third degree burn',(DATE '2021-03-22'),(DATE '2021-03-28'));
+insert into Admitted_Patients values ('07','102','nephrology','dialysis',(DATE '2021-03-23'),(DATE '2021-03-23'));
+insert into Admitted_Patients values ('15','103','burn','first degree burn',(DATE '2021-03-24'),(DATE '2021-04-01'));
+insert into Admitted_Patients values ('07','104','nephrology','kidney failure',(DATE '2021-03-22'),(DATE '2021-03-27'));
+insert into Admitted_Patients values ('01','106','burn','first degree burn ',(DATE '2021-03-21'),(DATE '2021-03-28'));
+insert into Admitted_Patients values ('06','107','ICU','stroke',(DATE '2021-03-22'),(DATE '2021-03-28'));
+insert into Admitted_Patients values ('15','108','burn','third  degree burn',(DATE '2021-03-22'),null);
+insert into Admitted_Patients values ('06','110','ICU','stroke',(DATE '2021-03-26'),(DATE '2021-03-31'));
+insert into Admitted_Patients values ('04','112','emergency medicine','Respiratory Difficulties',(DATE '2021-03-20'),null);
+insert into Admitted_Patients values ('03','114','emergency medicine','pain',(DATE '2021-03-21'),(DATE '2021-03-27'));
+insert into Admitted_Patients values ('05','115','ICU','stroke',(DATE '2021-03-22'),null);
+insert into Admitted_Patients values ('12','116','children','fever',(DATE '2021-03-28'),(DATE '2021-03-28'));
+insert into Admitted_Patients values ('08','128','ICU','coronary blockage',(DATE '2021-03-29'),(DATE '2021-03-31'));
+insert into Admitted_Patients values ('12','125','children','fever',(DATE '2021-03-22'),(DATE '2021-04-24'));
+insert into Admitted_Patients values ('02','122','CCU','fractured knee',(DATE '2021-03-22'),null);
+insert into Admitted_Patients values ('18','123','NICU','fractured skull',(DATE '2021-03-22'),null);
+insert into Admitted_Patients values ('17','124','NICU','knee injury',(DATE '2021-03-22'),null);
+insert into Admitted_Patients values ('15','105','burn','third  degree burn',(DATE '2021-03-01'),(DATE '2021-03-22'));
+insert into Admitted_Patients values ('12','117','children','fever',(DATE '2021-03-28'),(DATE '2021-04-28'));
+
+
+
+
+
+select * from Admitted_Patients;
+Update Admitted_Patients set condition='Asthma' where patient_id='122';
+Update Admitted_Patients set release_date=(DATE '2023-03-22') where patient_id='125';
+select * from admitted_patients;
+
+
+--Appointment
+insert into Appointment values ('01','101',(DATE '2023-04-01'),'10:00 am');
+insert into Appointment values ('01','102',(DATE '2023-04-01'),'8:00 am');
+insert into Appointment values ('02','103',(DATE '2023-04-02'),'10:00 am');
+insert into Appointment values ('03','103',(DATE '2023-04-03'),'9:00 am');
+insert into Appointment values ('04','108',(DATE '2023-04-03'),'10:00 am');
+insert into Appointment values ('04','110',(DATE '2023-04-01'),'8:00 am');
+insert into Appointment values ('04','111',(DATE '2023-04-02'),'10:00 am');
+insert into Appointment values ('05','113',(DATE '2023-04-03'),'9:00 am');
+insert into Appointment values ('06','114',(DATE '2023-04-05'),'10:00 am');
+insert into Appointment values ('07','117',(DATE '2023-04-06'),'8:00 am');
+insert into Appointment values ('07','118',(DATE '2023-04-01'),'10:00 am');
+insert into Appointment values ('08','120',(DATE '2023-04-02'),'9:00 am');
+insert into Appointment values ('09','121',(DATE '2023-04-03'),'10:00 am');
+insert into Appointment values ('10','121',(DATE '2023-04-04'),'8:00 am');
+insert into Appointment values ('11','123',(DATE '2023-04-06'),'10:00 am');
+insert into Appointment values ('12','126',(DATE '2023-04-02'),'9:00 am');
+insert into Appointment values ('13','127',(DATE '2023-04-05'),'10:00 am');
+insert into Appointment values ('14','127',(DATE '2023-04-03'),'8:00 am');
+insert into Appointment values ('15','128',(DATE '2023-04-01'),'10:00 am');
+insert into Appointment values ('16','130',(DATE '2023-04-02'),'9:00 am');
+insert into Appointment values ('15','109',(DATE '2023-04-01'),'10:00 am');
+insert into Appointment values ('13','125',(DATE '2023-04-01'),'8:00 am');
+insert into Appointment values ('17','129',(DATE '2023-04-02'),'10:00 am');
+insert into Appointment values ('18','116',(DATE '2023-04-02'),'9:00 am');
+select * from Appointment;
+
+
+--select query
+select * from Doctor where unit='surgery';
+select * from Doctor where unit<>'surgery';
+select * from Patient where gender='M';
+select * from Patient where age<25;
+select * from Patient where age<25 AND age>13;
+select * from Patient where age<10 or age>21;
+select patient_id from medical_history where condition='asthma';
+select patient_id from Admitted_Patients where ward='ICU';
+select patient_id from Admitted_Patients where ward='ICU' AND doctor_id='08';
+select * from Appointment where doctor_id='01';
+
+
+--string,union,intersect,except
+select * from Doctor where unit like 'ne%logy';
+select * from Doctor where unit like 'ne___logy';
+select * from Doctor where unit like '%logy';
+select * from Doctor where unit like '%o%';
+select * from Doctor where unit like '%o%' union select * from Doctor where unit like '%logy';
+select * from Doctor where unit like '%o%' intersect select * from Doctor where unit like '%logy';
+select * from Doctor where unit like '%o%' except select * from Doctor where unit like '%logy';
+
+
+--nested query
+select doctor_name from Doctor where doctor_id=(select doctor_id from Appointment where patient_id=101);
+--use 'in' for more than 1 row
+select doctor_name from Doctor where doctor_id in (select doctor_id from Appointment where patient_id=103);
+select doctor_name from Doctor where doctor_id in (select doctor_id from Appointment where patient_id=121);
+
+select doctor_name from Doctor where doctor_id = (select doctor_id from Appointment where patient_id=121 and Appointment_date=(DATE '2023-04-03'));
+
+
+--if an admitted patient has history of asthma then display the name of his/her current doctor
+ select doctor_name from Doctor where doctor_id in (select doctor_id from Admitted_Patients where patient_id in (select patient_id from medical_history where condition='Asthma'));
+
+
+--medical history of patients who have appointments with a specific doctor
+select * from medical_history where patient_id in (select patient_id from Appointment where doctor_id in (select doctor_id from Doctor where doctor_name='Dr Jibon nesa'));
+
+--nested query in update
+update Patient set email='roxsana1@gmail.com' where patient_id in (select patient_id from Admitted_Patients where doctor_id in (select doctor_id from Doctor where doctor_name='Dr Md. Mukitul Huda')) and patient_name='Roxsana';
+
+
+select * from Patient where patient_id in (select patient_id from Admitted_Patients where doctor_id in (select doctor_id from Doctor where doctor_name='Dr Md. Mukitul Huda')) and patient_name='Roxsana';
+
+
+
+
+
+--with clause
+ with max_age(age) as (select max(age) from Patient)
+ select * from Patient, max_age where max_age.age=Patient.age;
+with min_age(m_age) as (select min(age) from Patient)
+ select * from Patient, min_age where min_age.m_age=Patient.age;
+
+
+
+
+--Aggregate function
+select count(*) from Doctor;
+select count(*) as number_of_doctor from Doctor;
+select count (distinct doctor_name) as Distinct_doc_name from Doctor;
+select count(age) as ages_of_patient from Patient;
+select count (distinct age) as Distinct_patient_age from Patient;
+select avg(age) as avg_age from Patient;
+select sum(age) as sum_age from Patient;
+select max(age) as max_age from Patient;
+select min(age) as min_age from Patient;
+select avg(age) from patient where age>5;
+
+
+--Group by and Having
+
+select condition, count(patient_id) from medical_history group by condition;
+select ward,count(patient_id) from Admitted_Patients group by ward;
+select unit,count(*) from Doctor group by unit having unit like '____';
+select age,count(age) from patient group by age having age>20;
+
+--set membership
+select * from medical_history where condition='Asthma' OR condition='Stroke';
+select * from Patient where age>10 and patient_id in (select patient_id from medical_history where condition ='Heart attack');
+select * from Patient where patient_id not in (select patient_id from Admitted_Patients);
+
+
+
+
+--some/all / exists
+select * from Patient where patient.age> some(select age from Patient where age>=13);
+select * from Patient where patient.age>= all(select age from Patient where age>=2);
+select * from Patient where patient.age> all(select age from Patient where age<40);
+--max age 43 so no rows selected
+select * from Patient where patient.age> some(select age from Patient where age>=43);
+select * from Patient where patient.age> all(select age from Patient where age>=13);
+select patient_id from Patient where age>10 and exists (select patient_id from Appointment where doctor_id=100);
+select * from Patient where age>10 and exists (select patient_id from appointment where doctor_id=01);
+select patient_id from Patient where exists (select patient_id from medical_history);
+
+
+--Join operation
+
+--natural join(attr not specified)
+select * from Patient natural join medical_history;
+select * from medical_history natural join Patient; 
+select * from Patient natural join medical_history where age>20;
+select * from Patient natural join Admitted_Patients;
+
+--join or inner join
+select * from Doctor join Appointment using(doctor_id);
+select * from Doctor join Appointment using(doctor_id) where unit='surgery';
+select * from Patient join Admitted_Patients using(patient_id);
+--alternative syntax
+select * from Patient join Admitted_Patients on Patient.patient_id=Admitted_Patients.patient_id;
+select * from Patient join Admitted_Patients using(patient_id) where age>20;
+
+--left outer join
+select * from Patient left outer join Admitted_Patients using (patient_id);
+select * from Admitted_Patients left outer join Patient using (patient_id);
+
+
+--right outer join
+select * from Patient right outer join Admitted_Patients using (patient_id);
+select * from Admitted_Patients right outer join Patient using (patient_id);
+
+
+--View
+
+create view DocName as select doctor_id,doctor_name from Doctor;
+create view treated_under as select * from Admitted_Patients where doctor_id=(select doctor_id from Doctor where doctor_name='Dr Nabila Paul');
+create view  custom as select * from DocName where doctor_name like '%a%';
+drop view custom;
+drop view DocName;
+drop view treated_under;
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+--end
\ No newline at end of file
diff --git a/PLSQL.sql b/PLSQL.sql
new file mode 100644
index 0000000..70ad343
--- /dev/null
+++ b/PLSQL.sql
@@ -0,0 +1,355 @@
+set serveroutput on
+declare
+doc_name varchar(30);
+
+begin
+--displays 1 row
+select doctor_name into doc_name from DOCTOR where DOCTOR.DOCTOR_ID=01;
+dbms_output.put_line(doc_name);
+
+end;
+/
+
+
+
+
+--%type
+set serveroutput on
+declare
+p_name PATIENT.PATIENT_NAME%type;
+p_age PATIENT.AGE%type;
+p_gender PATIENT.GENDER%type;
+begin 
+select PATIENT.patient_name , age , PATIENT.GENDER into p_name,p_age , p_gender from PATIENT where patient_id=101;
+dbms_output.put_line('name : '||p_name||' ; age : '||p_age ||' ; Gender : '||p_gender );
+end;
+/
+
+
+
+
+--default value and insert
+
+set serveroutput on
+declare
+p_id PATIENT.PATIENT_ID%type :=134;
+p_name PATIENT.PATIENT_NAME%type :='Ananya';
+p_email PATIENT.EMAIL%type :='ananya10@gmail.com';
+p_phone PATIENT.PHONE_NO%type :='0123569';
+p_age PATIENT.AGE%type :=23;
+p_gender PATIENT.GENDER%type :='F';
+begin
+ insert into Patient values (p_id,p_name,p_email,p_phone,p_age,p_gender);
+end;
+/
+--example
+select * from Patient where patient_id=134;
+delete from Patient where patient_id=134;
+
+
+
+
+
+--%rowtype
+set serveroutput on
+declare 
+doc_row DOCTOR%rowtype;
+begin
+select doctor_id,doctor_name,unit into doc_row.doctor_id,doc_row.doctor_name,doc_row.unit from DOCTOR where doctor_id=7;
+dbms_output.put_line(doc_row.doctor_id || ' '|| doc_row.DOCTOR_NAME || ' '|| doc_row.UNIT);
+end;
+/
+
+
+
+
+
+--cursor
+
+
+--1
+set serveroutput on
+declare
+p_var PATIENT%Rowtype;
+cursor C is select * from PATIENT where age>20;
+begin
+open C;
+fetch C into p_var.PATIENT_ID,p_var.patient_name,p_var.email,p_var.PHONE_NO,p_var.AGE,p_var.GENDER;
+while C%FOUND loop
+fetch C into p_var.PATIENT_ID,p_var.patient_name,p_var.email,p_var.PHONE_NO,p_var.AGE,p_var.GENDER;
+dbms_output.put_line(p_var.patient_id || ' '|| p_var.patient_name );
+end loop;
+close C;
+end;
+/
+
+
+
+
+
+--2: rowcount 
+
+set serveroutput on
+declare 
+cursor C is select * from medical_history;
+var medical_history%Rowtype;
+i int :=0;
+begin
+open C;
+fetch C into var.patient_id, var.condition,var.treatment_history;
+while C%FOUND
+loop
+--step by step rows
+dbms_output.put_line('row : ' || C%rowcount);
+fetch C into var.patient_id, var.condition,var.treatment_history;
+end loop;
+-- Total row
+dbms_output.put_line('Total row : ' || C%rowcount);
+
+close C;
+end;
+/
+
+
+
+
+
+
+--Varray
+
+set serveroutput on
+declare
+type namelist is Varray(5) of DOCTOR.DOCTOR_NAME%type;
+counter int;
+names DOCTOR.DOCTOR_NAME%type;
+namearray namelist :=namelist();
+begin
+counter :=1;
+for x in 3..6 loop
+select doctor_name into names from DOCTOR where doctor_id=x;
+namearray.extend();
+namearray (counter) :=names;
+counter := counter +1;
+end loop;
+counter :=1;
+while counter <=namearray.count
+loop
+DBMS_OUTPUT.PUT_LINE(namearray(counter)); 
+    counter:=counter+1;
+
+end loop;
+end;
+/
+
+
+
+
+
+
+
+--Varray without extend()
+
+set serveroutput on
+declare
+type namelist is Varray(5) of DOCTOR.DOCTOR_NAME%type;
+counter int;
+names DOCTOR.DOCTOR_NAME%type;
+namearray namelist := namelist('name1','name2','name3','name4');
+begin
+counter :=1;
+for x in 4..7 loop
+select doctor_name into names from DOCTOR where doctor_id=x;
+namearray (counter) :=names;
+counter := counter +1;
+end loop;
+counter :=1;
+while counter <=namearray.count
+loop
+DBMS_OUTPUT.PUT_LINE(namearray(counter)); 
+    counter:=counter+1;
+
+end loop;
+end;
+/
+
+
+
+
+
+
+--conditional statements
+
+set serveroutput on
+DECLARE 
+   working_unit DOCTOR.UNIT%type;
+BEGIN
+   FOR x IN 1..18  
+   LOOP
+      SELECT unit INTO working_unit FROM doctor WHERE doctor_id=x;
+      if working_unit='burn' 
+        then
+        dbms_output.put_line(' works in burn unit ');
+      elsif working_unit='surgery'  
+        then
+         dbms_output.put_line(' This doctor is a surgeon ');
+      else 
+         dbms_output.put_line(' other ');
+        end if;
+   END LOOP;
+END;
+
+
+
+
+
+
+
+
+
+
+--procedure
+
+create or replace procedure Find_Doc(pat_name in varchar,doc_name out varchar) as
+text varchar(30);
+--doc_name DOCTOR.DOCTOR_NAME%type;
+
+begin
+select doctor_name into doc_name from DOCTOR where doctor_id = (select doctor_id  from ADMITTED_PATIENTS where patient_id = (select patient_id from Patient where patient_name=pat_name));
+text:='procedure result : ';
+dbms_output.put_line(text || doc_name);
+end;
+/
+set serveroutput on
+declare
+pat_name PATIENT.PATIENT_NAME%type := 'Shimu';
+doc_name DOCTOR.DOCTOR_NAME%type; 
+
+begin
+find_doc(pat_name,doc_name);
+end;
+/
+
+
+
+
+--using SYS_REFCURSOR 
+--given a patient name find the name of the doctor in charge
+
+set serveroutput on
+--multiple row output
+CREATE OR REPLACE PROCEDURE Find_Doc_many(pat_name IN VARCHAR2, doc_name OUT SYS_REFCURSOR) AS
+  text VARCHAR2(30);
+BEGIN
+  OPEN doc_name FOR
+    SELECT doctor_name
+    FROM DOCTOR
+    WHERE doctor_id = (
+      SELECT doctor_id
+      FROM ADMITTED_PATIENTS
+      WHERE patient_id = (
+        SELECT patient_id
+        FROM Patient
+        WHERE patient_name = pat_name
+      )
+    );
+    
+  DBMS_OUTPUT.PUT_LINE('Procedure result:');
+  LOOP
+    FETCH doc_name INTO text;
+    EXIT WHEN doc_name%NOTFOUND;
+    DBMS_OUTPUT.PUT_LINE(text);
+  END LOOP;
+  
+  CLOSE doc_name;
+END;
+/
+set serveroutput on
+DECLARE
+  pat_name PATIENT.PATIENT_NAME%TYPE := 'Shimu';
+  doc_name SYS_REFCURSOR;
+BEGIN
+  Find_Doc_many(pat_name, doc_name);
+END;
+
+
+
+--Given a condition check if any currently admitted patient has history of this condition
+
+set serveroutput on
+Create or replace Procedure find_pat (condn in varchar, p_name out varchar,pat OUT SYS_REFCURSOR) AS
+begin
+OPEN pat for
+select patient_name into p_name from PATIENT where patient_id in (select patient_id from ADMITTED_PATIENTS where patient_id in (
+select patient_id from MEDICAL_HISTORY where condition=condn));
+loop
+    fetch pat into p_name ;
+    EXIT WHEN pat%NOTFOUND;
+    DBMS_OUTPUT.PUT_LINE('patient ' || p_name || ' has ' || condn );
+  END LOOP;
+  
+  CLOSE pat;
+END;
+DECLARE
+  pat SYS_REFCURSOR;
+  p_name PATIENT.PATIENT_NAME%type;
+BEGIN
+  find_pat('Stroke',p_name,pat);
+END;
+/
+
+
+-- if any patient is admitted for more than 10 days print the patient's name
+set serveroutput on
+create OR replace procedure Days(d OUT SYS_REFCURSOR) AS
+  p_name PATIENT.PATIENT_NAME%type;
+begin
+  open d for select patient_name into p_name from PATIENT where patient_id in (select patient_id from ADMITTED_PATIENTS where
+  release_date-admit_date>=10);
+  loop
+    fetch d into p_name ;
+    EXIT WHEN d%NOTFOUND;
+    DBMS_OUTPUT.PUT_LINE('patient ' || p_name || ' has severe condition' );
+  END LOOP;
+  
+  CLOSE d;
+END;
+DECLARE
+  d SYS_REFCURSOR;
+BEGIN
+  Days(d);
+END;
+/
+
+
+
+
+
+
+--function
+
+create or replace function find_pat_name(var1 in int) return varchar AS
+value patient.patient_name%type;
+begin
+  select patient_name into value from patient where patient_id=var1; 
+   return value;
+end;
+/
+set serveroutput on
+declare 
+value varchar(20);
+begin
+value:=find_pat_name(121);
+dbms_output.put_line ('The Functional value : ' || value);
+end;
+/
+
+
+
+
+--drop function or procedure
+drop procedure Find_Doc;
+drop function find_pat_name;
+drop PROCEDURE Find_Doc_many;
+
+
+
diff --git a/Schema.docx b/Schema.docx
new file mode 100644
index 0000000..e6a9754
Binary files /dev/null and b/Schema.docx differ
diff --git a/Trigger.sql b/Trigger.sql
new file mode 100644
index 0000000..5a9fca1
--- /dev/null
+++ b/Trigger.sql
@@ -0,0 +1,55 @@
+--trigger
+
+--Insertion into Patient when an new patient is admitted
+
+SET SERVEROUTPUT ON
+CREATE OR REPLACE TRIGGER trigger_patient
+BEFORE INSERT on Admitted_Patients
+for each row
+enable
+begin
+INSERT into Patient values (:new.patient_id,'not entered','','000000','0','N');
+end;
+/
+insert into Admitted_Patients values ('01','135','burn','asthma',(Date '2023-04-15'),'');
+select * from Admitted_Patients where patient_id=135;
+select * from Patient where patient_id=135;
+delete from Admitted_Patients where patient_id=135;
+--delete from medical_history where patient_id=135;
+delete from Patient where patient_id=135;
+
+drop Trigger trigger_patient;
+
+
+
+
+
+SET SERVEROUTPUT ON
+
+CREATE OR REPLACE TRIGGER trigger_history
+AFTER INSERT on Admitted_Patients
+FOR EACH ROW
+ENABLE
+DECLARE
+  v_patient_id Admitted_Patients.patient_id%TYPE;
+BEGIN
+  v_patient_id := :new.patient_id;
+  INSERT INTO medical_history 
+  VALUES (v_patient_id, :new.condition, 'ongoing');
+END;
+/
+
+insert into patient values ('136', 'abc', '', '01635099', '50', 'M');
+insert into Admitted_Patients values ('01', '136', 'burn', 'asthma', (Date '2023-04-15'), '');
+select * from Admitted_Patients where patient_id = '136';
+select * from medical_history where patient_id = '136';
+delete from Admitted_Patients where patient_id = '136';
+delete from medical_history where patient_id = '136';
+delete from patient where patient_id = '136';
+
+
+
+drop Trigger trigger_history;
+
+
+show errors;
\ No newline at end of file