Column constraints-on delete cascade, Database Management System

Assignment Help:

CREATE TABLE prodtrans

(

pno number (4)

ptype char (1) CHECK (ptype in ('I','R','S')), qty number (5)

FOREIGN KEY pno REFERENCES product (pno) ON DELETE CASCADE);

In the table so formed please reminder the referential constraint on the foreign key pno in prodtrans table to product table. Any product record if removed from the product table will trigger deletion of all the related records (ON DELETE CASCADE) in the prodtrans table.

Related Discussions:- Column constraints-on delete cascade

Query to delete constraint from alter table, A constraint named less_than_2...

A constraint named less_than_20 was defined on the field date_of_birth of table student. Delete this constraint. ALTER TABLE student DROP CONSTRAINT less_than_20;

Define deadlock recovery measures, Define Deadlock recovery measures ...

Define Deadlock recovery measures To recover from deadlock, the cycle in the wait-for-graph should be broken. The common technique of doing this is to rollbac

Define the term- state, State The position of object at any moment is ...

State The position of object at any moment is called state. An object can have many states depend upon time. After receiving some input instructions, the object can change its

I need helpin assignment, My cut off date is very soon in a Database subjec...

My cut off date is very soon in a Database subject and i dont know how to solve anything in it

What are object interaction diagrams, What are object interaction diagrams?...

What are object interaction diagrams? Object interaction diagrams are the diagrams that used to describe order in which messages are communicated in execution of an operation,

A weak entity set and its identifying relationship, Q. Define a weak entit...

Q. Define a weak entity set and its identifying relationship. List the necessary conditions for a meaningful identifying relationship set of a weak entity set. Entity is a t

Identify the critical activities, Consider a systems development project wi...

Consider a systems development project with the following data Activity Duration (weeks) Precedence Relationship 1. Software design

What is completeness constraint on generalization, What is completeness con...

What is completeness constraint on generalization? Define the variation between total and partial design constraint. Give an example each. Ans: Completeness Constraints

Define the categories of sql statements, Define the categories of SQL State...

Define the categories of SQL Statements? 1) Statements that don't return a result set. This statement class includes INSERT, DELETE, and UPDATE. 2)Statements that return

Explain Lock-Based protocols, # ???? ..

# ???? ..

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages