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Synonyms It allows short names or alternative names for objects.
Example:
CREATE SYNONYM D30
FOR EMPD30;
Now if we give command:
SELECT * FROM D30;
NAME
MINSAL
MAXSAL
AVGSAL
---------------------
------------
-------------
--------------
ACCOUNTING
1300
5000
2916.6667
RESEARCH
800
3000
2175
SALES
950
2850
1566.6667
Example :; transfers transfer_amount from x's account to y's account ; Supposes x&y both accounts exist TRANSACTION (x, y, transfer_amount) Start transaction IF X AND Y
List the table modification commands in SQL? A) Deletion B) Updates C) Insertion D) Update of a view
explain concept of decomposition?
please give me introduction to full data in D B M S in a short assignment
(a) Why did SAP introduce the extended star schema?
What is difference between TRUNCATE and DELETE? - Truncate can't be rolled back whereas Delete can be. - Truncate keeps the lock on table whereas Delete keeps the lock on ea
Set Difference If R1 and R2 are two union compatible relations or relations then result of R3 =R1- R2 is the relation that have only those tuples that are in R1 but not in R2.
Explain Stand Alone Query Language in details? Stand alone Query Language - The query language that can be used interactively is known as stand alone query language. It does no
#explain five disadvantages of a dbms..
Question 1 Explain the concept of Foreign Key. How a foreign key differs from a Primary Key? Can the Foreign Key accept nulls? Question 2 With a necessary example explain (i)
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