Answer:
The correct answer is Option A (Referential integrity)
Explanation:
When a relational database table is in first normal form, that means it has no repeating fields or groups of fields, and hence all rows have the same columns, while if a relational database table is in second normal form, it implies that every non-key field is functionally dependent on the primary key. If can be in the third normal form if no non-key field is functionally dependent on any other non-key field.
A relational database on its own is a universal approved database model whose data is stored in tables divided into records and fields that serve as an information unit that organizes data points for easy access.
In the relational database, foreign keys are being checked to reference the primary key and enforce referential integrity so as to ensure that the foreign key must have a matching primary key. It means the reference from a row in one table to another table must be valid. Referential integrity concerns the concept of a foreign key normally enforced by the database management system.
Answer:
(A) 1
Explanation:
In UNIX the file system the file system is a central part of the operating system. The file system is for storage and retrieval of information. Programs that form the UNIX system also stores information in files.
UNIX file systems supports three files namely: ordinary file, directory files, device files or special files.
If we need to access bytes 2500-2503 it means the bytes are within the third block. So we will need only one access.
Note this is because the file control block (inside) is within the memory. If file control block was not in the memory we would have needed more disk accessses.
Plan for the unexpected
write a solid business plan
Keep lines of communication open
Predict how business is progressing
Yes, Using programming libraries is one way of incorporating existing code into new programs is a true statement.
<h3>What function do libraries provide in programming?</h3>
Programming libraries are helpful resources that can speed up the work of a web developer. They offer prewritten, reuseable portions of code so that programmers can easily and quickly create apps. Consider building a program that enables users to enroll in and pay for courses.
Therefore, Using a code library often saves developers from having to create everything from scratch. It can take less time to develop projects and have more reliable software if the catalog of programming resources is kept up well.
Learn more about libraries from
brainly.com/question/17960151
#SPJ1
Answer:
Technology refers to methods, systems, and devices which are the result of scientific knowledge being used for practical purposes. Technology is changing fast. They should be allowed to wait for cheaper technologies to be developed.
