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Give the general form of SQL query?
Select A1, A2............., An
From R1, R2..............., Rm
Where P
Consider the relations described below: PHYSICIAN (regno, name, telno, city) PATIENT (pname, street, city) VISIT (pname, regno, date_of_visit, fee) Where the regno and pname ide
Define the terms i) Entity type ii) Entity set Entity type: An entity type describes a collection of entities that have the similar attributes. Entity set: The set of all en
Define hot swapping? Hot swapping permits the removal of faulty disks and changes it by new ones without turning power off. Hot swapping decreases the mean time to repair.
Define Physical and Logical independence Ans: Physical data independence: The ability to modify physical level without causing application program to be rewritten. Logic
Multiple column Queries: Syntax: SELECT COLUMN1, COL2,...... FROM TABLE WHERE (COLUMN1, COL2, ...) IN (SELECT COLUMN1, COL2,.... FROM TABLE WHERE );
Consider an information system designed for an online company which provides IT products and services These include desktops, laptops, networking products, IT books, parts, and
WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
In which form of relational database developer refers to a record? In a tuple form of relational database developer refers to a record.
A relationship set is a set of relationships of the similar type. For example, let consider the relationship among two entities sets course and student. Collection of all the in
For the relations R and S given below: R S A B C 1 4 7 2 5 8 3 6 9
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