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Assignment 2 (DBMS)

This document contains questions and answers about SQL queries and database concepts. Q1 asks to write queries to find (i) customer names with savings and loan accounts, and (ii) customer names with only loan accounts. Q2 describes database transactions including commit to make changes permanent, rollback to undo, and savepoints to divide transactions. Q3 provides sample queries on employee and department tables including finding maximum salary, increasing all salaries, filtering managers, and locations. Q4 defines the GRANT command to give users privileges and REVOKE to remove them, along with syntax examples.

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143 views2 pages

Assignment 2 (DBMS)

This document contains questions and answers about SQL queries and database concepts. Q1 asks to write queries to find (i) customer names with savings and loan accounts, and (ii) customer names with only loan accounts. Q2 describes database transactions including commit to make changes permanent, rollback to undo, and savepoints to divide transactions. Q3 provides sample queries on employee and department tables including finding maximum salary, increasing all salaries, filtering managers, and locations. Q4 defines the GRANT command to give users privileges and REVOKE to remove them, along with syntax examples.

Uploaded by

Hack Mania
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Assignment 2

Q.1. Consider following schema:


Depositor (cust_name, acc_no)
Borrower (cust_name, loan_no)
Solve following queries:
(i) Find customer name having saving account as well as loan account.
(ii) Fine customer names having loan account but not the savings account.
Ans : (i) Find customer name having saving account as well as loan account.
Select d.cust_name
From depositor d, borrower b
Where d.cust_name = b.cust_name;
(ii) Fine customer names having loan account but not the savings
account. Select b.cust_name from borrower minus
select d.cust_name from depositor
where d.cust_name = b.cust_name;
Q.2. Describe Commit, Rollback and save point with example.
Ans : 1.Commit :
Commit command is used to make the last transaction permanent in the database.
Commit used to end the transaction and it removes Save Point.
Syntax : commit ;
Example : (After the final transaction.)
Commit;
2.Rollback :
Rollback undo’s the work done in the database.
Syntax : Rollback ; (this is used to roll back to last Save point)
Rollback to Save point < name>; (this is to roll back to particular save point)
Example : Rollback to Save Point V1 ;
3.Save point :
Save point define the breakpoints for the transaction. We can use them to divide big
program/transaction into smaller one.
Syntax : Savepoint <name>;
Example : Savepoint S1;

Q.3. Consider following schema: employee


{empid,empname,designation,salary,deptno}
dept { deptno,deptname,location}
Write SQL queries for following :
Ans : i) Find maximum salary for deptno=10;
select max(salary) from employee where
deptno = 10; ii) Increase salary of all employee
by 5%
Update employee set salary = salary + salary*0.05 ; iii)

Get the names of all ‘Manager’ select empname from

employee where designation like ‘Manager’. iv) Display

deptnames located at ‘Pune’ and ‘Nagpur.

Select deptname from dept where location in


(‘Pune’,’Nagpur’); Q.4. Describe GRANT and Revoke with its
syntax and example.
Ans : Grant :
This command is used to give permission to user to do operation on the other
user object.
Syntax : Grant <object privileges> on <object name> to <username>
[with grant option];
Example: Grant update on student to
yash; Revoke :
This command is used to remove permission from user given to him.
Syntax : Revoke <object privileges> on <object name> from <username>;
Example: Revoke update on student from yash;

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