a) What do you understand by the primary key?
b) What is DBMS? List the two advantages of using DBMS.
c) What is an image tag in HTML? Write HTML code for image tag?
d) What is hyperlink? Name the three types of links.
Answers
Answer:
A•In the relational model of databases, a primary key is a specific choice of a minimal set of attributes (columns) that uniquely specify a tuple (row) in a relation (table). Informally, a primary key is "which attributes identify a record", and in simple cases are simply a single attribute: a unique id.
B•A Database Management System (DBMS) is defined as the software system that allows users to define, create, maintain and control access to the database. DBMS makes it possible for end users to create, read, update and delete data in databas
C•The HTML <img> tag is used to embed an image in a web page. Images are not technically inserted into a web page; images are linked to web pages. The <img> tag creates a holding space for the referenced image. The <img> tag is empty, it contains attributes only, and does not have a closing tag.
D•Text hyperlink – Uses a word or phrase to take visitors to another page, file or document. Image hyperlink – Uses an image to take visitors to another page, file or document. Bookmark hyperlink – Uses text or an image to take visitors to another part of a web page.
Explanation:
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