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!
What are the several kinds of the update operations on relations? Also explain the constraints on these update operation. Give instance in support of your answer.
There are three primary update separation on relations: (i) Insert : It is used to insert a latest tuple or tuples in a relation. Insert can violate any of the four tuples of constraints: Domain constraints, key constraints, entity integrity and referential integrity (ii) Delete : It is used to delete tuples. The delete operation can violate just referential integrity, if the tuple being deleted is referenced through the foreign keys from other tuples in the database (iii) Modify: It is used to change value of a few attributes in existing tuples. Modify can also violate any of the four constraints as specified within insert operation.
Examples: (1) Inserting a tuple having null value for primary key violates entity integrity (2) Deleting a tuple in a table for that tuples exist other tables that are dependent on those tuples will violate referential key integrity. (3) Modifying a primary key attribute to any other such that is aheady exists in the table will violate entity integrity.
What is the role of a database administrator?
Use Delegation to Share Implementation The delegation " Delegation comprises of catching an operation on one object and sending it to other object which is part, or related to
1. Use the Invoice table structure shown below to answer the following questions: a) Draw the dependency diagram and identify the primary key and all dependencies, including al
If one requires to access data using Logical Database , the use of events is unavoidable. Yes, if someone wants to access data using Logical database then the use of events
I need an ERD created for any original database(can be on anything). It needs to be 3NF. I then need all the CREATE STATEMENTS, INSERT STATEMENTS(anything you can think of as long
List the set operations of SQL? 1) Union 2) Intersect operation 3) The except operation
Submit SQL INSERT Statements that will populate the database with sample data. You must insert at least 5 records into each table in your database.Submit your SQL INSERT Statement
what is view?explain
In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.
Explain I command in QBE ? I : It is the command in QBE that is used to insert tuple (s) into the database
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: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd