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Credentials
- `CCE230953344@ictorcl`
- `student`
## SQL Logs
```sql
SQL> create table PERSON(driver_id# varchar(30) primary key,name varchar(50),address varchar(100));
Table created.
SQL> desc person
Name Null? Type
----------------------------------------- -------- ----------------------------
DRIVER_ID# NOT NULL VARCHAR2(30)
NAME VARCHAR2(50)
ADDRESS VARCHAR2(100)
SQL> create table CAR(regno varchar(20) primary key,model varchar(30),year int);
Table created.
SQL> create table ACCIDENT(report_number int, accd_date date, location varchar(50));
Table created.
SQL> desc accident
Name Null? Type
----------------------------------------- -------- ----------------------------
REPORT_NUMBER NUMBER(38)
ACCD_DATE DATE
LOCATION VARCHAR2(50)
SQL> alter table accident add constraint pkey primary key(report_number);
Table altered.
SQL> desc ACCIDENT;
Name Null? Type
----------------------------------------- -------- ----------------------------
REPORT_NUMBER NOT NULL NUMBER(38)
ACCD_DATE DATE
LOCATION
SQL> create table OWNS (driver_id# varchar(30),regno varchar(20),primary key(driver_id#,regno),constraint fkey1 foreign key(driver_id#)references PERSON (driver_id#),constraint fkey2 foreign key(regno)references CAR);
Table created.
SQL> desc OWNS
Name Null? Type
----------------------------------------- -------- ----------------------------
DRIVER_ID# NOT NULL VARCHAR2(30)
REGNO NOT NULL VARCHAR2(20)
SQL> select table_name from user_tables;
TABLE_NAME
--------------------------------------------------------------------------------
ACCIDENT
CAR
OWNS
PERSON
SQL> create table PARTICIPATED (driver_id# varchar(30), regno varchar(20), report_number int, damage_amount int, primary key(driver_id#,regno,report_number),constraint fkey1participated foreign key(driver_id#) references Person(driver_id#),constraint fkey2participated foreign key(regno) references car(regno),constraint fkey3paricipated foreign key(report_number) references accident);
Table created.
SQL> desc PARTICIPATED
Name Null? Type
----------------------------------------- -------- ----------------------------
DRIVER_ID# NOT NULL VARCHAR2(30)
REGNO NOT NULL VARCHAR2(20)
REPORT_NUMBER NOT NULL NUMBER(38)
DAMAGE_AMOUNT NUMBER(38)
```
Now, we enter values.
```sql
SQL> insert into person values(1234,'Rohan','Delhi India');
1 row created.
SQL> select * from person;
DRIVER_ID# NAME
---------- --------------------------------------------------
ADDRESS
--------------------------------------------------------------------------------
1234 Rohan
Delhi India
SQL> alter table person modify driver_id# varchar (30);
Table altered.
SQL> insert into person values(1235,'Rohit','Banglalore India');
1 row created.
SQL> insert into person values(1236,'Ramesh','Baharashtra India');
1 row created.
SQL> insert into person values(1237,'Saarthak','Manipal India');
1 row created.
SQL> desc person;
Name Null? Type
----------------------------------------- -------- ----------------------------
DRIVER_ID# NOT NULL VARCHAR2(30)
NAME VARCHAR2(50)
ADDRESS VARCHAR2(100)
SQL> select * from person;
DRIVER_ID#
------------------------------
NAME
--------------------------------------------------
ADDRESS
--------------------------------------------------------------------------------
1234
Rohan
Delhi India
1235
Rohit
Banglalore India
DRIVER_ID#
------------------------------
NAME
--------------------------------------------------
ADDRESS
--------------------------------------------------------------------------------
1236
Ramesh
Baharashtra India
1237
Saarthak
DRIVER_ID#
------------------------------
NAME
--------------------------------------------------
ADDRESS
--------------------------------------------------------------------------------
Manipal India
```
Now, we modify the varchar sizes so that we can fix the display formatting.
```sql
SQL> alter table person modify address varchar (30);
Table altered.
SQL> select * from person;
DRIVER_ID# NAME
------------------------------ ----------------------------------------
ADDRESS
------------------------------
1234 Rohan
Delhi India
1235 Rohit
Banglalore India
1236 Ramesh
Baharashtra India
DRIVER_ID# NAME
------------------------------ ----------------------------------------
ADDRESS
------------------------------
1237 Saarthak
Manipal India
SQL> alter table person modify driver_id# varchar (4);
Table altered.
SQL> alter table person modify name varchar (10);
Table altered.
SQL> select * from person;
DRIV NAME ADDRESS
---- ---------- ------------------------------
1234 Rohan Delhi India
1235 Rohit Banglalore India
1236 Ramesh Baharashtra India
1237 Saarthak Manipal India
```
Data updation.
```sql
SQL> update person set address='Maharashtra India' WHERE driver_id# = 1236;
1 row updated.
SQL> select * from person;
DRIV NAME ADDRESS
---- ---------- ------------------------------
1234 Rohan Delhi India
1235 Rohit Banglalore India
1236 Ramesh Maharashtra India
1237 Saarthak Manipal India
SQL> insert into person values(1238, 'Amogh', 'Muzaffarnagar');
1 row created.
```
### Listing Tables
```sql
SQL> select table_name from user_tables;
TABLE_NAME
--------------------------------------------------------------------------------
ACCIDENT
CAR
OWNS
PARTICIPATED
PERSON
```
More Data Entry.
```sql
SQL> insert into car values('ABCD0001','Celtos',3);
1 row created.
SQL> insert into car values('EFGH2001','Ferrari',32);
1 row created.
SQL> insert into car values('DSDS0001','Urus',5);
1 row created.
SQL> insert into car values('ABCD4001','Honda City',1);
1 row created.
SQL> insert into car values('HFSP5601','mini cooper',7);
1 row created.
SQL> select * from car;
REGNO MODEL YEAR
-------------------- ------------------------------ ----------
ABCD0001 Celtos 3
EFGH2001 Ferrari 32
DSDS0001 Urus 5
ABCD4001 Honda City 1
HFSP5601 mini cooper 7
SQL> insert into accident values(0001,'01-Jan-2024','Delhi India');
1 row created.
SQL> select * from accident;
REPORT_NUMBER ACCD_DATE LOCATION
------------- --------- --------------------------------------------------
1 01-JAN-24 Delhi India
SQL> insert into accident values(0003,'29-feb-2024',' India');
1 row created.
SQL> insert into accident values(0004,'11-Oct-1993',' Daman and Diu India');
1 row created.
SQL> insert into accident values(0005,'31-march-2200',' Gujrat India');
1 row created.
SQL> insert into accident values(12,'17-july-2900',' karnataka India');
1 row created.
SQL> select * from accident;
REPORT_NUMBER ACCD_DATE LOCATION
------------- --------- --------------------------------------------------
1 01-JAN-24 Delhi India
3 29-FEB-24 India
4 11-OCT-93 Daman and Diu India
5 31-MAR-00 Gujrat India
12 17-JUL-00 karnataka India
SQL> insert into owns values(1234,'ABCD0001');
1 row created.
SQL> insert into owns values(1235,'EFGH2001');
1 row created.
SQL> insert into owns values(1236,'DSDS0001');
1 row created.
SQL> insert into owns values(1237,'ABCD4001');
1 row created.
SQL> insert into owns values(1238,'HFSP5601');
1 row created.
SQL> select * from owns;
DRIVER_ID# REGNO
------------------------------ --------------------
1234 ABCD0001
1235 EFGH2001
1236 DSDS0001
1237 ABCD4001
1238 HFSP5601
```
Note:
```sql
SQL> @<FILEPATH>/filename.sql
```
will import the commands from a doc and run them.
Saved commands into `participated.sql`.
```sql
SQL> @C:\Users\student\Downloads\participated.sql
1 row created.
1 row created.
1 row created.
1 row created.
1 row created.
SQL> select * from participated;
DRIVER_ID# REGNO REPORT_NUMBER DAMAGE_AMOUNT
------------------------------ -------------------- ------------- -------------
1234 ABCD0001 1 10000
1236 DSDS0001 3 150
1237 ABCD4001 4 799
1238 HFSP5601 5 1500
1238 HFSP5601 12 95500
```
## Q3
Updating data entries:
```sql
SQL> update participated set damage_amount=25000 where regno='HFSP5601' and report_number=12;
1 row updated.
SQL> update participated set damage_amount=25000 where regno='ABCD0001' and report_number=12;
0 rows updated.
SQL> select * from participated;
DRIVER_ID# REGNO REPORT_NUMBER DAMAGE_AMOUNT
------------------------------ -------------------- ------------- -------------
1234 ABCD0001 1 10000
1236 DSDS0001 3 150
1237 ABCD4001 4 799
1238 HFSP5601 5 1500
1238 HFSP5601 12 25000
```
## Q4
### Dropping an attribute
```sql
SQL> alter table Participated
2 drop constraint fkey3paricipated;
Table altered.
SQL> select * from participated;
DRIVER_ID# REGNO REPORT_NUMBER DAMAGE_AMOUNT
------------------------------ -------------------- ------------- -------------
1234 ABCD0001 1 10000
1236 DSDS0001 3 150
1237 ABCD4001 4 799
1238 HFSP5601 5 1500
1238 HFSP5601 12 25000
```
Adding back the attribute.
```sql
SQL> alter table Participated
2 add constraint fkey3participated foreign key(report_number) references accident(report_number)
3 on delete cascade;
Table altered.
```
### Conditional Deletion
```sql
SQL> select * from accident;
REPORT_NUMBER ACCD_DATE LOCATION
------------- --------- --------------------------------------------------
1 01-JAN-24 Delhi India
3 29-FEB-24 India
4 11-OCT-93 Daman and Diu India
5 31-MAR-00 Gujrat India
12 17-JUL-00 karnataka India
SQL > delete from accident where extract(year from accd_date)=1993;
1 row deleted.
SQL> select * from accident;
REPORT_NUMBER ACCD_DATE LOCATION
------------- --------- --------------------------------------------------
1 01-JAN-24 Delhi India
3 29-FEB-24 India
5 31-MAR-00 Gujrat India
12 17-JUL-00 karnataka India
```
## Q5
```sql
SQL> alter table Participated drop constraint fkey3participated;
Table altered.
SQL> alter table Participated add constraint fkey3participated foreign key(report_number) references accident(report_number) on delete cascade;
Table altered.
```
## Q6
```sql
SQL> alter table participated add constraint checkparticipated check(Damage_amount>=0);
Table altered.
SQL> select * from participated;
DRIVER_ID# REGNO REPORT_NUMBER DAMAGE_AMOUNT
------------------------------ -------------------- ------------- -------------
1234 ABCD0001 1 10000
1236 DSDS0001 3 150
1238 HFSP5601 5 1500
1238 HFSP5601 12 25000
```