Which of the following statements is not true in a relational database?

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Which of the following statements is false with respect to relational DBMSrelational DBMS ?
Answer (Detailed Solution Below)
Which of the following are not true about relational databases?
What is true about a relational database?
Which is not a relational database element?
Which of the following rule relates to relational database model?

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Which of the following statements is false with respect to relational DBMSrelational DBMS ?

Foreign key constraints are referential integrity constraints.
Nulls reduce space requirements in tables.
A primary key uniquely identifies a row in a table.
A disadvantage of highly normalized tables is that queries may require too many time consuming joins.

Answer (Detailed Solution Below)

Option 2 : Nulls reduce space requirements in tables.

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10 Questions 10 Marks 10 Mins

Concept:

RDBMS stands for a relational database management system. A relational database is made up of a number of relations and corresponding relational database schema. RDBMS data is in the form of tables, records.

Explanation:

Consider the statements one by one :

1) Foreign key constraints are referential integrity constraints.

It is correct. The foreign key in a table refers to the primary key of another table. That is the reason foreign key constraints are referential integrity constraints. Foreign keys contain the attribute values equal or a subset as that or the primary key.

2)Nulls reduce space requirements in tables.

It is incorrect. Null does not reduce space in tables. When we apply the count function in a table, then it also counts the tuple having NULL value.

3) A primary key uniquely identifies a row in a table.

This statement is correct. A primary key helps in uniquely identifying a row in table. As attribute which is the primary key does not contain any duplicate values and also primary key value can not be NULL.

4)A disadvantage of highly normalized tables is that queries may require too many time consuming joins.

The given statement is correct. Highly normalized tables have time-consuming joins. Because it totally depends on the query, sometimes queries are too large such that the join operation will too much time to normalize the tables.

Which of the following are not true about relational databases?

Answer: c)NoSQL is the most popular standard for use with relational databases. The statement "NoSQL is the most popular standard for use with relational databases" is false as NOSql is for non-relational databases, and is not for use in relational db.

What is true about a relational database?

A relational database (RDB) is a way of structuring information in tables, rows, and columns. An RDB has the ability to establish links—or relationships–between information by joining tables, which makes it easy to understand and gain insights about the relationship between various data points.

Which is not a relational database element?

Non-relational/NoSQL databases: They have the ability to capture all types of data “Big Data” including unstructured data. They are document oriented. NoSQL or non-relational databases examples:MongoDB, Apache Cassandra, Redis, Couchbase and Apache HBase. They are best for Rapid Application Development.

Which of the following rule relates to relational database model?

Rule 0: Foundation rule For any system to be qualified as a relational database management system, it should manage its data using its relational capability.