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Give the general form of SQL query?
Select A1, A2............., An
From R1, R2..............., Rm
Where P
Deletion Anomalies: Loss of important Information: In some cases, useful information may be lost when a tuple is deleted. For instance, if we delete the tuple corresponding to stu
Can you help me with the following: Drop statements for all objects in the lab project. Create statements for all objects of the lab project Create indexes for foreign keys Cre
What is a foreign key, and what is it used for? A foreign key is used to establish relationships between relations in the relational model. Technically, a foreign key is a colu
At its most essential level the DBMS architecture can be divide into two parts: the back end and the front end. The back end is responsible for managing the physical database an
Write short notes on relational constraints? Relational Constraints are: 1. NOT NULL 2. Unique 3. Primary key 4. Foreign key 5. Table check
Which component is not included in database environment ? A users component is not included in database environment.
3NF Normal Form A relation schema R is in 3NF if it is in 2NF and for each FD X A either of the following is true X is a Super-key of R. A is a prime attribute of R
What are the various forms of data transparency? a) fragmentation transparency b) replication transparency c) location transparency
Describe the Association: Design Before we describe association design let us define association "Association is set of links between two objects in the object model". It is
WOUND-WAIT
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