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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.
What is meant by data-transfer rate? The data-transfer rate is the rate at which data can be retrieved from or kept to the disk.
Saving Derived Attributes to Avoid Re-computation As discussed, "redundancy means duplication of exact data". But, if multiple copies of same data are present in the system,
Consider the following relational schema: Doctor(DName,Reg_no) Patient(Pname, Disease) Assigned_To (Pname,Dname) Give expression in both Tuple calculus and Domain calculus for
What is the difference among a primary index and a secondary index? Primary Index: A primary index is an ordered file whose records are of fixed length along with two fields.
Example: //REVOKE ALL ON EMP FROM MCA12; (All permissions will be cancelled) You can also cancel only some of the permissions. Drop: A user-
write a database program for concurrency transaction in a bank
data models are being replaced over years. Reasons and why does that happen?
Discuss along with examples about several types of attributes present in the ER model? Types of Attributes are: • SIMPLE attributes are attributes which are drawn from the ato
Availability: A site having the copy of a replicated relation fails, even then the relation may be found in another site. Therefore, the system may carry on to process at least th
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
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