Answer:
Explanation:
A relational database is designed to enforce the uniqueness of primary keys by allowing only one row with a given primary key value in a table. A foreign key is a column or a set of columns in a table whose values correspond to the values of the primary key in another table.
Answer:
web crawlers or spider software
Explanation:
A search engine that crawls uses the web crawler or the spider software. And it also uses the server side JavaScript based crawlers and programming languages like Python and PHP. The search engine finds the content category through the meta keywords and directs the page to the index. The index contains details of similar types of pages, And each page has one category, and if category is not found which is rarest, a new category is being created.
Answer:
Quality of service (QOS).
Explanation:
In recent computer networking, the convergence of voice, video and text data packet has been made possible. There is no need for a dedicated network for a particular type of packet.
QOS or quality of set is a service rendered to voice or audio packets in VoIP phones to enhance communication.
The email is a digital mailing system that can be used to send all three packets. It enjoys the QOS as voice packets. It is given high preference for transmission and uses the TCP protocol to transmit data reliably.