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Define NULL value
NULL value NULL means something is unknown. It does NOT mean null (the digit 0). Null is as well employed as attribute value for a particular entity in which attribute is not applicable for example name of child for unmarried.
These are interactive interfaces, graphical that hide the difficulty of the DBMS and query language behind an intuitive, simple to understand, and convenient interface. This permit
What three major types of actions includes databases? Briefly discuss these The three major types of actions including databases are: (i) Defining: It includes specifyin
What is D command work in the respect of QBE? D: It is the command inside QBE to delete tuple(s) from the relation.
The ABC Bank authority now wants to create a database for their customers. So you are requested to modify your program of Assignment A3 as follows. The main program first displa
Which is another name for weak entity? Child is another name of weak entity.
What are the General Transformation Rules for Relational operations? Ans: The transformation rules transform one relational algebra expression to AN EQUIVALENT ONE 1. E
Give the reasons for allowing concurrency? The reasons for allowing concurrency is if the transactions run serially, a short transaction might have to wait for a preceding long
What is recovery management component? Ensuring durability is the responsibility of a software component of the base system known as the recovery management component.
DISADVANTAGES OF RDBMS
Explain how the associations are implemented as classes. A general approach in this case is to transform an association class into a simple class linked to two original classes
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