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Answer:
A) A tuple is a sequence of immutable Python objects. Tuples are sequences, just like lists. The differences between tuples and lists are, the tuples cannot be changed unlike lists andtuples use parentheses, whereas lists use square brackets. Creating a tuple is as simple as putting different comma-separated values
b )In the context of relational databases, a foreign key is a field in one table that uniquely identifies a row of another table or the same table. In simpler words, the foreign key is defined in a second table, but it refers to the primary key or a unique key in the first table
c A database management system (DBMS) is system software for creating and managing databases. The DBMS provides users and programmers with a systematic way to create, retrieve, update and manage data
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@Xfruti06X
a) Tuples
Tuples is also called Row Or record. The Row of data items in in relation corresponds to a record and is known as the tape of the Relation.
Properties of Tuples:
1.Order of tuples is irrelevant.
2. No two Tuples are same to each other in all entries.
3. All types of the relation have the same format and same number of entries.
b) Foreign key:
Foreign key is an attribute of a relation which may act as a primary key attribute of some another relation by which it creates relationship.
Properties of Foreign key
1.foreign key attribute may or may not be unique.
2.The data value of a cell cannot be empty.
3.The attribute cannot be divided into subparts .
C) DBMS
Database Management system is very important resource in the operation and management of an organization. With the increase demand of the data in the various organization such as banks, universities, railways, airlines etc, it becomes a necessity to store data in an organized manner, so that it can be used again and again.
Features of DBMS;
1.well oraganized.
2.it should be related.
3.It should be flexible to change