Add DBMS/SQL/Week3/SQLPlus1.md
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Aadit Agrawal
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DBMS/SQL/Week3/SQLPlus1.md
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DBMS/SQL/Week3/SQLPlus1.md
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Credentials
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- `CCE230953344@ictorcl`
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- `student`
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## SQL Logs
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```sql
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SQL> create table PERSON(driver_id# varchar(30) primary key,name varchar(50),address varchar(100));
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Table created.
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SQL> desc person
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Name Null? Type
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----------------------------------------- -------- ----------------------------
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DRIVER_ID# NOT NULL VARCHAR2(30)
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NAME VARCHAR2(50)
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ADDRESS VARCHAR2(100)
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SQL> create table CAR(regno varchar(20) primary key,model varchar(30),year int);
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Table created.
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SQL> create table ACCIDENT(report_number int, accd_date date, location varchar(50));
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Table created.
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SQL> desc accident
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Name Null? Type
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----------------------------------------- -------- ----------------------------
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REPORT_NUMBER NUMBER(38)
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ACCD_DATE DATE
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LOCATION VARCHAR2(50)
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SQL> alter table accident add constraint pkey primary key(report_number);
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Table altered.
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SQL> desc ACCIDENT;
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Name Null? Type
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----------------------------------------- -------- ----------------------------
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REPORT_NUMBER NOT NULL NUMBER(38)
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ACCD_DATE DATE
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LOCATION
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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);
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Table created.
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SQL> desc OWNS
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Name Null? Type
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----------------------------------------- -------- ----------------------------
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DRIVER_ID# NOT NULL VARCHAR2(30)
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REGNO NOT NULL VARCHAR2(20)
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SQL> select table_name from user_tables;
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TABLE_NAME
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--------------------------------------------------------------------------------
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ACCIDENT
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CAR
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OWNS
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PERSON
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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);
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Table created.
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SQL> desc PARTICIPATED
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Name Null? Type
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----------------------------------------- -------- ----------------------------
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DRIVER_ID# NOT NULL VARCHAR2(30)
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REGNO NOT NULL VARCHAR2(20)
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REPORT_NUMBER NOT NULL NUMBER(38)
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DAMAGE_AMOUNT NUMBER(38)
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```
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Now, we enter values.
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```sql
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SQL> insert into person values(1234,'Rohan','Delhi India');
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1 row created.
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SQL> select * from person;
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DRIVER_ID# NAME
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---------- --------------------------------------------------
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ADDRESS
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--------------------------------------------------------------------------------
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1234 Rohan
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Delhi India
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SQL> alter table person modify driver_id# varchar (30);
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Table altered.
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SQL> insert into person values(1235,'Rohit','Banglalore India');
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1 row created.
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SQL> insert into person values(1236,'Ramesh','Baharashtra India');
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1 row created.
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SQL> insert into person values(1237,'Saarthak','Manipal India');
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1 row created.
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SQL> desc person;
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Name Null? Type
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----------------------------------------- -------- ----------------------------
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DRIVER_ID# NOT NULL VARCHAR2(30)
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NAME VARCHAR2(50)
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ADDRESS VARCHAR2(100)
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SQL> select * from person;
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DRIVER_ID#
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------------------------------
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NAME
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--------------------------------------------------
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ADDRESS
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--------------------------------------------------------------------------------
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1234
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Rohan
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Delhi India
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1235
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Rohit
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Banglalore India
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DRIVER_ID#
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------------------------------
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NAME
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--------------------------------------------------
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ADDRESS
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--------------------------------------------------------------------------------
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1236
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Ramesh
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Baharashtra India
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1237
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Saarthak
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DRIVER_ID#
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------------------------------
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NAME
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--------------------------------------------------
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ADDRESS
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--------------------------------------------------------------------------------
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Manipal India
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```
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Now, we modify the varchar sizes so that we can fix the display formatting.
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```sql
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SQL> alter table person modify address varchar (30);
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Table altered.
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SQL> select * from person;
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DRIVER_ID# NAME
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------------------------------ ----------------------------------------
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ADDRESS
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------------------------------
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1234 Rohan
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Delhi India
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1235 Rohit
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Banglalore India
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1236 Ramesh
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Baharashtra India
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DRIVER_ID# NAME
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------------------------------ ----------------------------------------
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ADDRESS
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------------------------------
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1237 Saarthak
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Manipal India
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SQL> alter table person modify driver_id# varchar (4);
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Table altered.
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SQL> alter table person modify name varchar (10);
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Table altered.
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SQL> select * from person;
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DRIV NAME ADDRESS
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---- ---------- ------------------------------
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1234 Rohan Delhi India
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1235 Rohit Banglalore India
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1236 Ramesh Baharashtra India
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1237 Saarthak Manipal India
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```
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Data updation.
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```sql
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SQL> update person set address='Maharashtra India' WHERE driver_id# = 1236;
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1 row updated.
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SQL> select * from person;
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DRIV NAME ADDRESS
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---- ---------- ------------------------------
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1234 Rohan Delhi India
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1235 Rohit Banglalore India
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1236 Ramesh Maharashtra India
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1237 Saarthak Manipal India
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SQL> insert into person values(1238, 'Amogh', 'Muzaffarnagar');
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1 row created.
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```
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### Listing Tables
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```sql
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SQL> select table_name from user_tables;
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TABLE_NAME
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--------------------------------------------------------------------------------
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ACCIDENT
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CAR
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OWNS
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PARTICIPATED
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PERSON
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```
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More Data Entry.
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```sql
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SQL> insert into car values('ABCD0001','Celtos',3);
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1 row created.
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SQL> insert into car values('EFGH2001','Ferrari',32);
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1 row created.
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SQL> insert into car values('DSDS0001','Urus',5);
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1 row created.
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SQL> insert into car values('ABCD4001','Honda City',1);
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1 row created.
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SQL> insert into car values('HFSP5601','mini cooper',7);
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1 row created.
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SQL> select * from car;
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REGNO MODEL YEAR
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-------------------- ------------------------------ ----------
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ABCD0001 Celtos 3
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EFGH2001 Ferrari 32
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DSDS0001 Urus 5
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ABCD4001 Honda City 1
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HFSP5601 mini cooper 7
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SQL> insert into accident values(0001,'01-Jan-2024','Delhi India');
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1 row created.
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SQL> select * from accident;
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REPORT_NUMBER ACCD_DATE LOCATION
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------------- --------- --------------------------------------------------
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1 01-JAN-24 Delhi India
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SQL> insert into accident values(0003,'29-feb-2024',' India');
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1 row created.
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SQL> insert into accident values(0004,'11-Oct-1993',' Daman and Diu India');
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1 row created.
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SQL> insert into accident values(0005,'31-march-2200',' Gujrat India');
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1 row created.
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SQL> insert into accident values(12,'17-july-2900',' karnataka India');
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1 row created.
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SQL> select * from accident;
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REPORT_NUMBER ACCD_DATE LOCATION
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------------- --------- --------------------------------------------------
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1 01-JAN-24 Delhi India
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3 29-FEB-24 India
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4 11-OCT-93 Daman and Diu India
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5 31-MAR-00 Gujrat India
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12 17-JUL-00 karnataka India
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SQL> insert into owns values(1234,'ABCD0001');
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1 row created.
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SQL> insert into owns values(1235,'EFGH2001');
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1 row created.
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SQL> insert into owns values(1236,'DSDS0001');
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1 row created.
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SQL> insert into owns values(1237,'ABCD4001');
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1 row created.
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SQL> insert into owns values(1238,'HFSP5601');
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1 row created.
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SQL> select * from owns;
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DRIVER_ID# REGNO
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------------------------------ --------------------
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1234 ABCD0001
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1235 EFGH2001
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1236 DSDS0001
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1237 ABCD4001
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1238 HFSP5601
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```
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Note:
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```sql
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SQL> @<FILEPATH>/filename.sql
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```
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will import the commands from a doc and run them.
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Saved commands into `participated.sql`.
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```sql
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SQL> @C:\Users\student\Downloads\participated.sql
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1 row created.
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1 row created.
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1 row created.
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1 row created.
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1 row created.
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SQL> select * from participated;
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DRIVER_ID# REGNO REPORT_NUMBER DAMAGE_AMOUNT
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------------------------------ -------------------- ------------- -------------
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1234 ABCD0001 1 10000
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1236 DSDS0001 3 150
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1237 ABCD4001 4 799
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1238 HFSP5601 5 1500
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1238 HFSP5601 12 95500
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```
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## Q3
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Updating data entries:
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```sql
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SQL> update participated set damage_amount=25000 where regno='HFSP5601' and report_number=12;
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1 row updated.
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SQL> update participated set damage_amount=25000 where regno='ABCD0001' and report_number=12;
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0 rows updated.
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SQL> select * from participated;
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DRIVER_ID# REGNO REPORT_NUMBER DAMAGE_AMOUNT
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------------------------------ -------------------- ------------- -------------
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1234 ABCD0001 1 10000
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1236 DSDS0001 3 150
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1237 ABCD4001 4 799
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1238 HFSP5601 5 1500
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1238 HFSP5601 12 25000
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```
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## Q4
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### Dropping an attribute
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```sql
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SQL> alter table Participated
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2 drop constraint fkey3paricipated;
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Table altered.
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SQL> select * from participated;
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DRIVER_ID# REGNO REPORT_NUMBER DAMAGE_AMOUNT
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------------------------------ -------------------- ------------- -------------
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1234 ABCD0001 1 10000
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1236 DSDS0001 3 150
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1237 ABCD4001 4 799
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1238 HFSP5601 5 1500
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1238 HFSP5601 12 25000
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```
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Adding back the attribute.
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```sql
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SQL> alter table Participated
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2 add constraint fkey3participated foreign key(report_number) references accident(report_number)
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3 on delete cascade;
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Table altered.
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```
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### Conditional Deletion
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```sql
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SQL> select * from accident;
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REPORT_NUMBER ACCD_DATE LOCATION
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------------- --------- --------------------------------------------------
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1 01-JAN-24 Delhi India
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3 29-FEB-24 India
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4 11-OCT-93 Daman and Diu India
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5 31-MAR-00 Gujrat India
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12 17-JUL-00 karnataka India
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SQL > delete from accident where extract(year from accd_date)=1993;
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1 row deleted.
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SQL> select * from accident;
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REPORT_NUMBER ACCD_DATE LOCATION
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------------- --------- --------------------------------------------------
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1 01-JAN-24 Delhi India
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3 29-FEB-24 India
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5 31-MAR-00 Gujrat India
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12 17-JUL-00 karnataka India
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```
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## Q5
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```sql
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SQL> alter table Participated drop constraint fkey3participated;
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Table altered.
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SQL> alter table Participated add constraint fkey3participated foreign key(report_number) references accident(report_number) on delete cascade;
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Table altered.
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```
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## Q6
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```sql
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SQL> alter table participated add constraint checkparticipated check(Damage_amount>=0);
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Table altered.
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SQL> select * from participated;
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DRIVER_ID# REGNO REPORT_NUMBER DAMAGE_AMOUNT
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------------------------------ -------------------- ------------- -------------
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1234 ABCD0001 1 10000
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1236 DSDS0001 3 150
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1238 HFSP5601 5 1500
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1238 HFSP5601 12 25000
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```
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