diff --git a/DDL(1907100).sql b/DDL(1907100).sql
new file mode 100644
index 0000000..4336c9a
--- /dev/null
+++ b/DDL(1907100).sql
@@ -0,0 +1,163 @@
+
+
+drop table transaction_info;
+drop table train_schedule_info;
+drop table route_info;
+drop table ticket_info;
+drop table passenger_info;
+drop table train_info;
+drop table station_info;
+
+select table_name from user_tables;
+
+
+
+
+
+create table station_info(
+station_id NUMBER(20),
+station_name varchar(40) UNIQUE not null,
+location varchar(40) not null,
+primary key(station_id),
+CONSTRAINT positive_1 CHECK (station_id > 0)
+);
+
+
+
+
+
+create table train_info(
+train_id NUMBER(20),
+train_name varchar(40) UNIQUE not null,
+train_type varchar(40) not null,
+destination_station_id NUMBER(20) not null, 
+departure_time varchar(20) not null,
+arrival_time varchar(20) not null,
+primary key(train_id),
+CONSTRAINT positive_2 CHECK (train_id > 0),
+foreign key(destination_station_id) references station_info(station_id)
+on delete cascade
+);
+
+
+
+
+
+
+create table passenger_info
+(
+passenger_id NUMBER(20),
+first_name varchar(20) not null,
+middle_name varchar(20),
+last_name varchar(20) not null,
+email varchar(40) NULL UNIQUE,
+phone_number varchar(20) UNIQUE not null,
+primary key(passenger_id),
+CONSTRAINT chk_length CHECK (length(phone_number)=11), 
+CONSTRAINT positive_3 CHECK (passenger_id> 0)
+);
+
+
+create table ticket_info
+(
+ticket_id NUMBER(20),
+passenger_id NUMBER(20) UNIQUE not null,
+train_id NUMBER(20) not null,
+journey_date date not null,
+destination_station_id NUMBER(20) not null,
+coach_number varchar(20) not null,
+coach_type varchar(20) not null,
+total_seats NUMBER(20) not null,
+seat_numbers varchar(40) not null,
+fare_amount NUMBER(20) not null CONSTRAINT ck_non_negative_amount CHECK (fare_amount > 0),
+primary key(ticket_id),
+CONSTRAINT positive_4 CHECK (ticket_id> 0),
+CONSTRAINT seat CHECK (total_seats<=36),
+foreign key(train_id) references train_info(train_id),
+foreign key(passenger_id) references passenger_info(passenger_id),
+foreign key(destination_station_id) references station_info(station_id)
+on delete cascade
+);
+
+
+
+
+create table route_info(
+route_id NUMBER(20) CONSTRAINT positive_5 CHECK (route_id > 0),
+train_id NUMBER(20),
+route_name varchar(40) not null,
+station_id_to NUMBER(20) not null,
+primary key(route_id,train_id),
+foreign key(train_id) references train_info(train_id),
+foreign key(station_id_to) references station_info(station_id)
+on delete cascade
+);
+
+alter table route_info rename column station_id_to to final_destination_station_id;
+
+
+
+
+create table train_schedule_info(
+route_id NUMBER(20),
+train_id NUMBER(20),
+running_days varchar(40) not null,
+primary key(route_id,train_id),
+CONSTRAINT fk
+foreign key(route_id,train_id) references route_info(route_id,train_id)
+on delete cascade
+);
+
+alter table train_schedule_info modify running_days varchar(100);
+
+
+
+
+
+create table transaction_info(
+transaction_id NUMBER(20) CONSTRAINT positive_6 CHECK(transaction_id>0),
+ticket_id NUMBER(20) UNIQUE not null,
+transaction_date date not null,
+payment_method varchar(40) not null,
+transaction_amount NUMBER(20) not null CONSTRAINT non_negative_amount CHECK (transaction_amount> 0),
+primary key(transaction_id),
+foreign key(ticket_id) references ticket_info(ticket_id)
+on delete cascade
+);
+
+
+select table_name from user_tables;
+
+
+alter table transaction_info add location varchar(40);
+alter table transaction_info drop column location; 
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/DML(1907100).sql b/DML(1907100).sql
new file mode 100644
index 0000000..a95c2e7
--- /dev/null
+++ b/DML(1907100).sql
@@ -0,0 +1,190 @@
+
+set pagesize 100
+set linesize 200
+
+insert into station_info(station_id,station_name,location) values(1,'Airport Railway Station','Dhaka');
+insert into station_info(station_id,station_name,location) values(2,'Tongi Railway Junction','Gazipur');
+insert into station_info(station_id,station_name,location) values(3,'Akhaura Railway Junction','Brahmanbaria');
+insert into station_info(station_id,station_name,location) values(4,'Sylhet Railway Station','Sylhet');
+insert into station_info(station_id,station_name,location) values(5,'Lakhsham Railway Junction','Cumilla');
+insert into station_info(station_id,station_name,location) values(6,'Chittagong Railway Station','Chittagong');
+insert into station_info(station_id,station_name,location) values(7,'Khulna Railway Station','Khulna');
+insert into station_info(station_id,station_name,location) values(8,'Ishwardi Railway Junction','Pabna');
+insert into station_info(station_id,station_name,location) values(9,'Rajshahi Railway Station','Rajshahi');
+insert into station_info(station_id,station_name,location) values(10,'Saidpur Railway Station','Nilphamari');
+
+
+
+insert into train_info(train_id,train_name,train_type,destination_station_id,departure_time,arrival_time)values(1000,'Commuter-1','Commuter',1,'6:00 am','6:30 am');
+insert into train_info(train_id,train_name,train_type,destination_station_id,departure_time,arrival_time)values(1001,'Commuter-2','Commuter',2,'6:00 am','6:50 am');
+insert into train_info(train_id,train_name,train_type,destination_station_id,departure_time,arrival_time)values(1002,'Parabat Express','Inter-City',4,'7:00 am','2:00 pm');
+insert into train_info(train_id,train_name,train_type,destination_station_id,departure_time,arrival_time)values(1003,'Sonar Bangla Express','Inter-City',6,'8:00 am','2:00 pm');
+insert into train_info(train_id,train_name,train_type,destination_station_id,departure_time,arrival_time)values(1004,'Suborno Express','Inter-City',6,'3:30 pm','9:00 pm');
+insert into train_info(train_id,train_name,train_type,destination_station_id,departure_time,arrival_time)values(1005,'Turna Express','Inter-City',6,'11:00 pm','6:00 am');
+insert into train_info(train_id,train_name,train_type,destination_station_id,departure_time,arrival_time)values(1006,'Chittagong Mail Express','Mail-Train',6,'7.30 am','4:00 pm');
+insert into train_info(train_id,train_name,train_type,destination_station_id,departure_time,arrival_time)values(1007,'Sundarban Express','Inter-City',7,'8:00 am','6:30 pm');
+insert into train_info(train_id,train_name,train_type,destination_station_id,departure_time,arrival_time)values(1008,'Chittra Express','Inter-City',7,'10:00 pm','6:30 am');
+insert into train_info(train_id,train_name,train_type,destination_station_id,departure_time,arrival_time)values(1009,'Bananlota Express','Inter-City',9,'7:00 am','12:30 pm');
+insert into train_info(train_id,train_name,train_type,destination_station_id,departure_time,arrival_time)values(1010,'Silk City Express','Inter-City',9,'2:40 pm','8:00 pm');
+insert into train_info(train_id,train_name,train_type,destination_station_id,departure_time,arrival_time)values(1011,'Nilsagar Express','Inter-City',10,'10:00 pm','7:00 am');
+
+
+insert into passenger_info(passenger_id,first_name,middle_name,last_name,email,phone_number)values(1,'Shureed',NULL,'Shazzad','shureedshazzad534@gmail.com','01798052279');
+insert into passenger_info(passenger_id,first_name,middle_name,last_name,email,phone_number)values(2,'Abdur',NULL,'Rahim',NULL,'01798042279');
+insert into passenger_info(passenger_id,first_name,middle_name,last_name,email,phone_number)values(3,'Abdur','Rahman','Hridoy','hridoy@gmail.com','01898052279');
+insert into passenger_info(passenger_id,first_name,middle_name,last_name,email,phone_number)values(4,'Shazzad',NULL,'Selim','shazzad@gmail.com','01816486565');
+insert into passenger_info(passenger_id,first_name,middle_name,last_name,email,phone_number)values(5,'Shifat','Sharmin','Chowdhury','shifat@gmail.com','01716399615');
+insert into passenger_info(passenger_id,first_name,middle_name,last_name,email,phone_number)values(6,'Tahamid',NULL,'Alam','tahmid@gmail.com','01516399615');
+insert into passenger_info(passenger_id,first_name,middle_name,last_name,email,phone_number)values(7,'Abdul',NULL,'Jabbar',NULL,'01917865349');
+insert into passenger_info(passenger_id,first_name,middle_name,last_name,email,phone_number)values(8,'Mohammad',NULL,'Harun','harun@gmail.com','01516825349');
+insert into passenger_info(passenger_id,first_name,middle_name,last_name,email,phone_number)values(9,'Abul','Kalam','Azad',NULL,'01917865390');
+insert into passenger_info(passenger_id,first_name,middle_name,last_name,email,phone_number)values(10,'Mohammad',NULL,'Naim','naim@gmail.com','01312655349');
+
+
+insert into ticket_info(ticket_id,passenger_id,train_id,journey_date,destination_station_id,coach_number,coach_type,total_seats,seat_numbers,fare_amount)values(2471,1,1000,DATE '2023-4-17',1,'A','Shulov',1,'A-2',20);
+insert into ticket_info(ticket_id,passenger_id,train_id,journey_date,destination_station_id,coach_number,coach_type,total_seats,seat_numbers,fare_amount)values(2472,2,1001,DATE '2023-4-17',2,'D','Shulov',1,'D-6',50);
+insert into ticket_info(ticket_id,passenger_id,train_id,journey_date,destination_station_id,coach_number,coach_type,total_seats,seat_numbers,fare_amount)values(2473,3,1002,DATE '2023-4-17',3,'F','Shovon Chair',1,'F-3',200);
+insert into ticket_info(ticket_id,passenger_id,train_id,journey_date,destination_station_id,coach_number,coach_type,total_seats,seat_numbers,fare_amount)values(2474,4,1002,DATE '2023-4-18',4,'B','Shovon Chair',1,'B-2',650);
+insert into ticket_info(ticket_id,passenger_id,train_id,journey_date,destination_station_id,coach_number,coach_type,total_seats,seat_numbers,fare_amount)values(2475,5,1003,DATE '2023-4-19',6,'F','Shovon Chair',1,'F-2',600);
+insert into ticket_info(ticket_id,passenger_id,train_id,journey_date,destination_station_id,coach_number,coach_type,total_seats,seat_numbers,fare_amount)values(2476,6,1003,DATE '2023-4-19',6,'A','Tapanokul Chaicoach',6,'A-2 A-3 A-4 A-5 A-6 A-7',5400);
+insert into ticket_info(ticket_id,passenger_id,train_id,journey_date,destination_station_id,coach_number,coach_type,total_seats,seat_numbers,fare_amount)values(2477,7,1005,DATE '2023-4-20',5,'D','Tapanokul Chaicoach',4,'D-2 D-3 D-4 D-5',2800);
+insert into ticket_info(ticket_id,passenger_id,train_id,journey_date,destination_station_id,coach_number,coach_type,total_seats,seat_numbers,fare_amount)values(2478,8,1005,DATE '2023-4-20',6,'E','Tapanokul Sleeper',4,'D-2 D-3 D-4 D-5',3600);
+insert into ticket_info(ticket_id,passenger_id,train_id,journey_date,destination_station_id,coach_number,coach_type,total_seats,seat_numbers,fare_amount)values(2479,9,1007,DATE '2023-4-22',7,'H','First Class',4,'D-2 D-3 D-4 D-5',4400);
+insert into ticket_info(ticket_id,passenger_id,train_id,journey_date,destination_station_id,coach_number,coach_type,total_seats,seat_numbers,fare_amount)values(2480,10,1008,DATE '2023-4-22',7,'H','Shovon Chair',4,'D-2 D-3 D-4 D-5',2700);
+
+
+
+
+insert into route_info(route_id,train_id,route_name,final_destination_station_id)values(10001,1002,'Dhaka-Sylhet',4);
+insert into route_info(route_id,train_id,route_name,final_destination_station_id)values(10002,1003,'Dhaka-Chittagong',6);
+insert into route_info(route_id,train_id,route_name,final_destination_station_id)values(10002,1004,'Dhaka-Chittagong',6);
+insert into route_info(route_id,train_id,route_name,final_destination_station_id)values(10002,1005,'Dhaka-Chittagong',6);
+insert into route_info(route_id,train_id,route_name,final_destination_station_id)values(10002,1006,'Dhaka-Chittagong',6);
+insert into route_info(route_id,train_id,route_name,final_destination_station_id)values(10003,1007,'Dhaka-Khulna',7);
+insert into route_info(route_id,train_id,route_name,final_destination_station_id)values(10003,1008,'Dhaka-Khulna',7);
+insert into route_info(route_id,train_id,route_name,final_destination_station_id)values(10004,1009,'Dhaka-Rajshahi',9);
+insert into route_info(route_id,train_id,route_name,final_destination_station_id)values(10004,1010,'Dhaka-Rajshahi',9);
+insert into route_info(route_id,train_id,route_name,final_destination_station_id)values(10005,1011,'Dhaka-Saidpur',10);
+
+
+
+
+insert into train_schedule_info(route_id,train_id,running_days)values(10001,1002,'Saturday,Sunday,Monday,Tuesday,Wednesday,Thursday,Friday');
+insert into train_schedule_info(route_id,train_id,running_days)values(10002,1003,'Saturday,Sunday,Monday,Tuesday,Wednesday,Friday');
+insert into train_schedule_info(route_id,train_id,running_days)values(10002,1004,'Saturday,Sunday,Monday,Tuesday,Wednesday,Thursday,Friday');
+insert into train_schedule_info(route_id,train_id,running_days)values(10002,1005,'Saturday,Sunday,Monday,Tuesday,Wednesday,Thursday,Friday');
+insert into train_schedule_info(route_id,train_id,running_days)values(10002,1006,'Saturday,Sunday,Monday,Tuesday,Thursday,Friday');
+insert into train_schedule_info(route_id,train_id,running_days)values(10003,1007,'Saturday,Sunday,Monday,Tuesday,Wednesday,Thursday');
+insert into train_schedule_info(route_id,train_id,running_days)values(10003,1008,'Saturday,Monday,Tuesday,Wednesday,Thursday,Friday');
+insert into train_schedule_info(route_id,train_id,running_days)values(10004,1009,'Saturday,Sunday,Monday,Tuesday,Wednesday,Thursday,Friday');
+insert into train_schedule_info(route_id,train_id,running_days)values(10004,1010,'Sunday,Monday,Tuesday,Wednesday,Thursday,Friday');
+insert into train_schedule_info(route_id,train_id,running_days)values(10005,1011,'Saturday,Sunday,Monday,Tuesday,Wednesday,Thursday,Friday');
+
+
+insert into transaction_info(transaction_id,ticket_id,transaction_date,payment_method,transaction_amount)values(15001,2471,DATE '2023-4-5','Bkash',20);
+insert into transaction_info(transaction_id,ticket_id,transaction_date,payment_method,transaction_amount)values(15002,2472,DATE '2023-4-5','Bkash',50);
+insert into transaction_info(transaction_id,ticket_id,transaction_date,payment_method,transaction_amount)values(15003,2473,DATE '2023-4-6','Bkash',200);
+insert into transaction_info(transaction_id,ticket_id,transaction_date,payment_method,transaction_amount)values(15004,2474,DATE '2023-4-6','Bkash',650);
+insert into transaction_info(transaction_id,ticket_id,transaction_date,payment_method,transaction_amount)values(15005,2475,DATE '2023-4-9','Bkash',600);
+insert into transaction_info(transaction_id,ticket_id,transaction_date,payment_method,transaction_amount)values(15006,2476,DATE '2023-4-9','Bkash',5400);
+insert into transaction_info(transaction_id,ticket_id,transaction_date,payment_method,transaction_amount)values(15007,2477,DATE '2023-4-9','Bkash',2800);
+insert into transaction_info(transaction_id,ticket_id,transaction_date,payment_method,transaction_amount)values(15008,2478,DATE '2023-4-13','Bkash',3600);
+insert into transaction_info(transaction_id,ticket_id,transaction_date,payment_method,transaction_amount)values(15009,2479,DATE '2023-4-13','Bkash',4400);
+insert into transaction_info(transaction_id,ticket_id,transaction_date,payment_method,transaction_amount)values(15010,2480,DATE '2023-4-17','Bkash',2700);
+
+--find passenger_info from passenger_table using transaction_id in transaction_info
+select first_name, phone_number from passenger_info where passenger_id in (select passenger_id from ticket_info where ticket_id in(select ticket_id from transaction_info where transaction_id=15001));
+
+
+
+--find destination_station_info using amount in transaction_info
+select station_name,location from station_info where station_id in (select destination_station_id from ticket_info where ticket_id in (select ticket_id from transaction_info where transaction_amount>50));
+
+
+
+--update station_location
+update station_info set location='Dinajpur' where station_id in (select destination_station_id from train_info where train_name='Nilsagar Express');
+
+
+
+select *from station_info;
+
+
+
+update station_info set location='Nilphamari' where station_id in (select destination_station_id from train_info where train_name='Nilsagar Express');
+
+
+
+select *from station_info;
+
+
+
+
+--deleteing a transaction
+delete from transaction_info where ticket_id in(select ticket_id from ticket_info where passenger_id in(select passenger_id from passenger_info where phone_number='01798052279'));
+
+
+select *from transaction_info;
+
+
+
+--passenger info who are going to Sylhet or Chittagong
+(select first_name from passenger_info where passenger_id in (select passenger_id from ticket_info where destination_station_id in(select station_id from station_info where location='Sylhet'))) union
+(select first_name from passenger_info where passenger_id in (select passenger_id from ticket_info where destination_station_id in(select station_id from station_info where location='Chittagong')));
+
+
+
+
+--passenger whose transaction_amount greater than average transaction
+select *from passenger_info where passenger_id in(select passenger_id from ticket_info where ticket_id in(select ticket_id from transaction_info where transaction_amount>=(select avg(transaction_amount) from transaction_info)));
+
+
+
+--transaction info group by date
+select transaction_date,avg(transaction_amount) from transaction_info group by transaction_date having avg(transaction_amount)>=50;
+
+
+
+--train which go to sylhet or chittagong from dhaka
+ select train_name from train_info where train_id in(select train_id from route_info where route_name='Dhaka-Sylhet' or route_name='Dhaka-Chittagong');
+
+
+
+--choosing transaction amount greater than 300
+ select *from transaction_info where transaction_amount > some(select transaction_amount from transaction_info where transaction_amount>=300);
+ select *from transaction_info where transaction_amount > all(select transaction_amount from transaction_info where transaction_amount>=300);
+
+
+--string operation
+ select  *from train_schedule_info where train_id in(select train_id from train_info where train_name like '%S%');
+
+
+--join operation
+select *from train_info join ticket_info on train_info.train_id=ticket_info.train_id
+join route_info on ticket_info.train_id=route_info.train_id
+join train_schedule_info on route_info.train_id=train_schedule_info.train_id;
+
+
+
+
+--view 
+create view station_location_detail as select station_name,location from station_info;
+select *from station_location_detail;
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/PL SQL(1907100).sql b/PL SQL(1907100).sql
new file mode 100644
index 0000000..732fbfd
--- /dev/null
+++ b/PL SQL(1907100).sql	
@@ -0,0 +1,165 @@
+
+--print station information using pl/sql
+set serveroutput on
+declare
+station_name station_info.station_name%type;
+location station_info.location%type;
+begin
+select station_name,location into station_name,location from station_info where station_id in(select destination_station_id  from ticket_info where passenger_id 
+in (select passenger_id from passenger_info where first_name='Shureed'));
+dbms_output.put_line('Station Name: '||station_name||' Loaction Name: '||location);
+end;
+/
+
+
+
+--insert info using pl/sql
+set serveroutput on 
+declare
+station_id station_info.station_id%type:=11;
+station_name station_info.station_name%type:='Bhoirob Bazar';
+location station_info.location%type:='Kishorgonj';
+begin
+insert into station_info values(station_id,station_name,location);
+end;
+/
+
+--print station information using pl/sql
+set serveroutput on
+declare 
+station_row station_info%rowtype;
+begin
+select station_name,location into station_row.station_name,station_row.location from station_info where station_id=1;
+dbms_output.put_line('Station Name: '||station_row.station_name||' Loaction Name: '||station_row.location);
+end;
+/
+
+--using cursor and loop to see passenger_info
+set serveroutput on
+declare
+cursor passenger_info_cursor is select * from passenger_info;
+passenger_row passenger_info%rowtype;
+begin
+open passenger_info_cursor;
+fetch passenger_info_cursor into passenger_row.passenger_id,passenger_row.first_name,passenger_row.middle_name,passenger_row.last_name,passenger_row.email,passenger_row.phone_number;
+while passenger_info_cursor%found loop
+dbms_output.put_line(passenger_row.passenger_id ||' ' || passenger_row.first_name || passenger_row.middle_name || passenger_row.last_name || passenger_row.email || passenger_row.phone_number);
+fetch passenger_info_cursor into passenger_row.passenger_id,passenger_row.first_name,passenger_row.middle_name,passenger_row.last_name,passenger_row.email,passenger_row.phone_number;
+end loop;
+close passenger_info_cursor;
+end;
+/
+
+
+--use of cursor,loop and array
+set serveroutput on
+declare
+cursor coach_cursor is select coach_type from ticket_info;
+counter NUMBER:=0;
+coach_type ticket_info.coach_type%type;
+type array is varray(10) of ticket_info.coach_type%type;
+myarray array:=array();
+Begin
+open coach_cursor;
+counter:=0;
+fetch coach_cursor into coach_type;
+while coach_cursor%found loop
+counter:=counter+1;
+myarray.extend();
+myarray(counter):=coach_type;
+fetch coach_cursor into coach_type;
+end loop;
+close coach_cursor;
+counter:=1;
+while counter<=myarray.count
+loop
+if (myarray(counter)='Shulov') or (myarray(counter)='Shovon Chair') then
+dbms_output.put_line(myarray(counter) ||' is non luxarious compartment');
+else
+dbms_output.put_line(myarray(counter) || ' is luxarious compartment');
+end if;
+counter:=counter+1;
+end loop;
+end;
+/
+
+--procedure
+set serveroutput on
+CREATE OR REPLACE PROCEDURE proc(
+var1 in NUMBER,
+var2 in NUMBER
+)
+As
+name varchar(20);
+res number;
+Begin
+res:=var2/var1;
+select first_name into name from passenger_info where passenger_id in(select passenger_id from ticket_info where total_seats=var1 and fare_amount=var2);
+DBMS_OUTPUT.PUT_LINE(name || ' spends '|| res ||'tk for per seat');
+ NULL;
+END;
+/
+set serveroutput on
+declare
+cursor info_cursor is select total_seats,fare_amount from ticket_info;
+total_seats ticket_info.total_seats%type;
+fare_amount ticket_info.fare_amount%type;
+begin
+open info_cursor;
+fetch info_cursor into total_seats,fare_amount;
+while info_cursor%found loop
+proc(total_seats,fare_amount);
+fetch info_cursor into total_seats,fare_amount;
+end loop;
+close info_cursor;
+end;
+/
+
+drop procedure proc;
+
+
+--function
+
+CREATE OR REPLACE function func(var1 in number,var2 in number) return NUMBER as
+value number;
+begin
+value:=var2/var1;
+return value;
+end;
+/
+
+set serveroutput on
+declare
+cursor info_cursor is select total_seats,fare_amount from ticket_info;
+seats ticket_info.total_seats%type;
+amount ticket_info.fare_amount%type;
+res number;
+name varchar(20);
+begin
+open info_cursor;
+fetch info_cursor into seats,amount;
+while info_cursor%found loop
+select first_name into name from passenger_info where passenger_id in(select passenger_id from ticket_info where total_seats=seats and fare_amount=amount);
+res:=func(seats,amount);
+DBMS_OUTPUT.PUT_LINE(name || ' spends '|| res ||'tk for per seat');
+fetch info_cursor into seats,amount;
+end loop;
+close info_cursor;
+end;
+/
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..253e29e
--- /dev/null
+++ b/README.md
@@ -0,0 +1 @@
+This is a database project related to a railway management system.