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Give an example of enforcement in Typing.
You can understand the idea of enforcement as it makes sure objects of dissimilar classes may not be interchanged as below:
Example: Fruit f; Vegetable v; Mango m;
This implies 'v' is variables of class Vegetable, 'm' of class Mango and 'f' of class Fruit. Typing ensures that value of 'f' never be assigned to 'v'.
However, if Mango extends Fruits, then 'f' may be assigned a value of 'm'. The variable of a sub class may be assigned to variable of super class, but not other way around while 'm' cannot be assigned a value of 'f'.
What is meant by normalization of data? It is a process of examining the given relation schemas based on their Functional Dependencies (FDs) and primary key to achieve the prop
What is the use of a slotted-page structure and what is the information are there in the header? The slotted-page structure is used for organizing records within a one block.
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);
Can we delete data element, which is being used by table fields. No we cant delete data element.
wh
Flights(FlightNo, DeptDateTime, Origin, ArrivalDateTime, Destination, Capacity, SoldSeats) Tickets(FlightNo, Seat, CustID) Where - flightNo is the PK of the flights table - DeptDa
Define the five basic operators of relational algebra? Five basic operators of relational algebra are: 1. Union (∪∪∪∪) - Selects tuples which are in either P or Q or in both
What is called remapping of bad sectors? If the controller detects that a sector is injured when the disk is initially formatted, or when an attempt is made to write the secto
Describe Embedded Query Language? Embedded Query Language - A query language (e.g., SQL) can be implemented in two ways. It can be used interactively or embedded within a host
What is normalization? It is a method of analysing the given relation schemas based on their Functional Dependencies (FDs) and primary key to attain the properties (1).Minim
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