Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Sub query in the UPDATE command:
Example: //Double the commission for employees, who have got at least 2 increments.
UPDATE EMP
SET COMM = COMM * 2
WHERE 2 <= ( SELECT COUNT (*) FROM INCR WHERE INCR.EMPNO = EMP.EMPNO
GROUP BY EMPNO);
Be advised that the use of subquery that counts the number of increments given to every employee stored in the INCR table. Please note the comparison, instead of ......>=2, we have written reverse of it as 2 <= .....
DELETE Command
In the following example, the deletion will be performed in EMP table.No deletion will be performed in the INCR table.
Example: Delete the records of employees who have got no increment.
DELETE FROM EMP
WHERE EMPNO NOT IN (SELECT EMPNO FROM INCR);
Differentiate between static hashing and dynamic hashing. Ans: Static Hashing comprises the number of primary pages in the directory fixed. So, while a bucket is full, we requ
losers with new information systems
Let us now talk about the relational operations: SELECT The select operation is used to select few specific record from the database based on different criteria, This is a un
what are the limitations of dbms?
The Locking Protocol: To manage concurrency related problems we use locking. A lock is mainly a variable that is associated with a data item in the database. A lock can be located
Describe the GRANT function and explain, how it associates to security. What kind of privileges may be granted? How are they revoked? Ans: Since more than one user can aacce
what is the relationship between receipt and owner entities in computer sales and service company
task upload
Funky Festivals Specification Funky Festivals organise music festivals which take place at various venues throughout the UK. A venue needs to be booked before a Festival can t
What is self-transition? If there is a transition which goes back to same state, it is known as "self- transition." With a trigger action exit action would be executed f
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd