L J INSTITUTE OF ENGINEERING & TECHNOLOGY, LJU
SUBJECT: - DATABASE MANAGEMENT SYSTEM
IPE PRACTICAL LIST_SEM-II_2022 SOLUTION
1. Write a PL/SQL block to swap two numbers without using third variable.
Ans:
SQL> set serveroutput on;
SQL> declare
a number;
b number;
begin
a:=&a;
b:=&b;
dbms_output.put_line(a||''||b);
a:=a+b;
b:=a-b;
a:=a-b;
dbms_output.put_line('after swapping:'||a||' '||b);
end;
/
OUTPUT:
2. Consider following relations:
Employee(empno, emp_name, dept,salary, doj, branch)
Answer the following queries in SQL:
1) Retrieve employee number and their salary
Ans: select empno, salary from employee;
2) Retrieve total salary of employee group by employee name and count similar
names
Ans: SELECT EMP_NAME, SUM(SALARY),COUNT(*) FROM EMPLOYEE
GROUP BY(EMP_NAME);
3) Retrieve total salary of employee group by employee name and salary which
is greater than >120000
Ans: SELECT EMP_NAME, SUM(SALARY) FROM EMPLOYEE
GROUP BY(EMP_NAME) HAVING SUM(SALARY)>120000;
4) Display name of employee in descending order
Ans: select emp_name from employee order by emp_name desc;
5) Display details of employee whose name is AMIT and salary greater than
50000;
Ans: select * from employee where emp_name='Amit' and salary>50000;
3. Given the table EMPLOYEE (EmpNo, Name, Salary, Designation, DeptID)
write a cursor to select the five highest paid employees from the table.
EMPLOYEE (EmpNo, Name, Salary, Designation, DeptID)
Ans:
declare
i number:=0;
cursor ec is select empno,name,salary from employee order by salary desc;
r ec%rowtype;
begin
open ec;
loop
exit when i=5;
fetch ec into r;
dbms_output.put_line(r.empno||' '||r.name||' '||r.salary);
i:=i+1;
end loop;
close ec;
end;
/
OUTPUT:
4. Write PL/SQL block to print whether the given number is Armstrong number
or not. If given number is Armstrong then insert that number into Armstrong
table.
Ans:
declare
n number:=&n;
s number:=0;
r number;
leng number;
m number;
begin
m:=n;
leng:=length(to_char(n));
while n>0 loop
r:=mod(n,10);
s:=s+power(r,leng);
n:=trunc(n/10);
end loop;
if m=s then
insert into armstrong values(m);
dbms_output.put_line('armstrong number');
else
dbms_output.put_line('not armstrong number');
end if;
end;
/
OUTPUT:
5. Write a PL/SQL cursor to display the names and branch of all students from the
STUDENT relation.
Ans:
DECLARE
CURSOR cur_test IS
SELECT name,BRANCH FROM student;
name1 student.name%TYPE;
branch1 student.branch%type;
BEGIN
OPEN cur_test;
if cur_test%isopen then
Loop
FETCH cur_test INTO name1,branch1;
EXIT WHEN cur_test%NOTFOUND;
DBMS_OUTPUT.PUT_LINE('Name: '||name1||’ ‘||'Branch: '||branch1);
END LOOP;
END IF;
CLOSE cur_test;
END;
/
OUTPUT:
6. Consider following relations:
Supplier(sid,sname,status,city)
Parts(pid,pname,color,weight,city)
Sp(sid,pid,quantity)
Answer the following queries:
1) Display the name of supplier who lives in ‘Ahmedabad’
Ans: Select sname from supplier where city=’Ahmedabad’
2) Display the parts name which is not supplied yet
Ans: Select sname from parts inner join sp on parts.pid<>sp.pid;
3) Find all supplier whose status is either 20 or 30
Ans: Select sname from supplier where status=20 or status=30;
4) Count how many times each supplier has supplied part ‘P2’
Ans: Select sid,count(*) from sp group by sid where pid=’P2’;
5) Delete a part from parts whose weight is more than 10kg.
Ans: DELETE FROM Parts WHERE weight>10;
7. Consider following relations:
employee(eid, name, address, dept, salary)
Answer the following queries:
1) Display the name and salary of employee who is taking maximum salary.
Ans: select name,salary from employee where salary=(select max(salary) from
employee);
2) Display the name of employee who works in department having count of
employee is less than 2.
Ans: select name from employee where dept in(select dept from employee group
by dept having count(*) < 2);
3) Display highest salary department wise and name of employee who is taking
that salary.
Ans: select name,salary from employee where salary in(select max(salary) from
employee group by dept);
4) Display second highest salary from employee table
Ans: select max(salary) from employee where salary <>(select max(salary) from
employee);
5) Display the details of employee whose name starts with ‘A’.
Ans: select * from employee where name like ‘A%’;
8. Write PL/SQL program to convert each digit of a given number into its
corresponding word format.
DECLARE
num INTEGER;
number_to_word VARCHAR2(100);
digit_str VARCHAR2(100);
len INTEGER;
digit INTEGER;
BEGIN
num := &num;
len := LENGTH(num);
dbms_output.PUT_LINE('Input: ' ||num);
FOR i IN 1..len LOOP
digit := SUBSTR(num, i, 1);
if(digit = 1) THEN
digit_str := 'one ';
elsif (digit = 2) THEN
digit_str := 'two ' ;
elsif (digit = 3) THEN
digit_str :='three ';
elsif (digit = 4) THEN
digit_str :='four ';
elsif (digit = 5) THEN
digit_str :='five ';
elsif (digit = 6) THEN
digit_str :='six ';
elsif (digit = 7) THEN
digit_str :='seven ';
elsif (digit = 8) THEN
digit_str :='eight ';
elsif (digit = 9) THEN
digit_str :='nine ';
elsif (digit = 0) THEN
digit_str :='zero ';
else
digit_str :='nan ';
end if;
number_to_word := number_to_word || digit_str;
END LOOP;
dbms_output.PUT_LINE('Output: ' ||number_to_word);
END;
9. Write PL/SQL program to find the sum of digits of a number.
DECLARE
--Declare variable n, temp_sum
-- and r of datatype number
n
number;
temp_sum number;
r
number;
BEGIN
n := &n;
temp_sum := 0;
-- here we check condition with the help of while loop
-- here <> symbol represent for not null
WHILE n <> 0 LOOP
r := n mod 10; Or r := MOD(n,10);
temp_sum := temp_sum + r;
n := Trunc(n / 10);
-- (Note:Trunc is used to remove decimal points from number,if we declare
variable of int type --then there is no need of trunc)
END LOOP;
dbms_output.Put_line('sum of digits = ' || temp_sum);
END;
/
10. Consider the following Tables and Write PL/SQL program to Transfer All the
Students having marks greater than 70 from ‘Student’ table into another table
named ‘star_batch’ using Explicit Cursor.
Student(id,name,mobile,marks,dob)
Star_batch(id,name,mobile,marks,dob)
11. Consider the following schema & create table for that:
BOOK (Book_id, Title, Publisher_Name, Pub_Year)
BOOK_AUTHORS (Book_id, Author_Name)
PUBLISHER (Name, Address, Phone)
BOOK_COPIES(Book_id, Branch_id, No-of_Copies)
BOOK_LENDING (Book_id, Branch_id, Card_No, Date_Out, Due_Date)
LIBRARY_BRANCH (Branch_id, Branch_Name, Address)
Write SQL queries to
1.Describe all the tables
a.
DESC BOOK;
b.
DESC BOOK_AUTHORS;
c.
DESC PUBLISHER;
d.
DESC BOOK_COPIES;
e.
DESC BOOK_LENDING;
f.
DESC LIBRARY_BRANCH;
2.Insert the details in all the tables
INSERT INTO BOOK VALUES (1,‘DBMS‘,‘JAN-2017‘, EMCGRAW-HILL‘);
INSERT INTO BOOK VALUES (50,‘ADBMS‘,‘JUN-2016‘, EMCGRAW-HILL‘);
INSERT INTO PUBLISHER VALUES (EMCGRAW-HILL‘, 9989076587,
EBANGALORE‘);
INSERT INTO BOOK_AUTHORS VALUES (‘NAVATHE‘, 2);
INSERT
INTO
LIBRARY_BRANCH
VALUES
(10,‘RR
NAGAR‘,‘BANGALORE‘);
INSERT INTO BOOK_COPIES VALUES (10, 1, 10);
INSERT INTO BOOK_LENDING VALUES ( 1, 10, 101, ‘01-JAN-17‘,‘01-JUL-17’);
INSERT INTO BOOK_LENDING VALUES ( 3, 14, 101, ‘11-JAN-17‘,‘11-MAR17’);
3.Retrieve details of all books in the library – id, title, name of publisher, authors
SELECT BOOK_ID, TITLE, PUBLISHER_NAME, AUTHOR_NAME,
FROM
BOOK
INNER
JOIN
BOOK_AUTHORS
ON
BOOK.BOOK_ID=BOOK_AUTHER.BOOK_ID;
4.Delete a book in BOOK table whose book_id is 50 .
DELETE FROM BOOK WHERE Book_id=50;
5. Get the particulars of borrowers who have borrowed more than 3 books, but
from Jan 2017 to Jun2017.
SELECT CARD_NO FROM
BOOK_LENDING
WHERE DATE_OUT BETWEEN ‘01-JAN-2017‘ AND ‘01-JUL-2017‘
GROUP BY CARD_NO
HAVING COUNT (*)>3;
12. Consider the following schema & create table for that:
Physician(regno,name,phone_no,city)
Patient(pname, street,city)
Visit(pname,regno,visitdate,fee)
Answer the following queries:
1) Get the name and regno of the physicians who lives in Mumbai
2) Find the name and city of the patient who visited physician on 01-aug-2022
3) Get the name of physician and total no of patients who visited that physician
4) Get the name of physician who have not visited any patient
13. Write queries for the following tables:
T1 ( Empno, Ename , Salary, Designation)
T2 (Empno, Deptno.)
(1) Display all the details of the employee whose salary is lesser than 10K.
(2) Display the Deptno in which Employee Seeta is working.
(3) Add a new column Deptname in table T2.
(4) Change the designation of Geeta from ‘Manager’ to ‘Senior Manager’.
(5) Find the total salary of all the employees.
(6) Display Empno, Ename, Deptno and Deptname.
14. Consider the relation Database.
Person(SSN, name, city)
Car(license_no, year, model, SSN)
Accident(drive_no, SSN, license_no, accidentyear, damage_amt)
1) Find out total no of cars that has accident in 1988.
2) Find the name of driver who did not have an accident in 'Delhi'
3) Find the car, who don't have total damage of more than 1000rs.
4) Find the cars sold in 2006 and whose owner are from vadodara.
5) How many different models of car are used by Mr.abc.
15. Write a PL/SQL cursor to display the names and branch of all students from the
STUDENT relation.
Ans:
DECLARE
CURSOR cur_test IS
SELECT name,BRANCH FROM student;
name1 student.name%TYPE;
branch1 student.branch%type;
BEGIN
OPEN cur_test;
if cur_test%isopen then
Loop
FETCH cur_test INTO name1,branch1;
EXIT WHEN cur_test%NOTFOUND;
DBMS_OUTPUT.PUT_LINE('Name: '||name1||'Branch: '||branch1);
END LOOP;
END IF;
CLOSE cur_test;
END;
/
16. Write a PL/SQL block to print the given number is prime or not.
Ans:
declare
num number;
i number:=1;
c number:=0;
begin
num:=&num;
for i in 1..num
loop
if((mod(num,i))=0) then
c:=c+1;
end if;
end loop;
if(c>2) then
dbms_output.put_line(num||' not a prime');
else
dbms_output.put_line(num||' is prime');
end if;
end;
/
17. Write a function that take employee no and return the salary with the help of
following table:
Emp(eno,ename,city,salary)
18. Write a procedure to display multiplication table of user input.
19. Write a trigger to check the pincode is exactly six digits or not for the following
table:
Emp(eno,ename,city,pincode)
20. Write a cursor to display the first ten records of the following table:
Student(rollno,name,address,city)