True / False Exercise -database Concepts

1. A primary goal of a database system is to share data with multiple users

True

False

A database system is designed to store and manage large amounts of data efficiently. One of its primary goals is to allow multiple users to access and share this data simultaneously. By providing a centralized and controlled environment for data storage and retrieval, a database system ensures that users can collaborate and work with the same set of data, promoting data consistency and integrity. This enhances productivity, facilitates data analysis and decision-making, and enables seamless integration of data across different applications and systems.

Explanation

A database system is designed to store and manage large amounts of data efficiently. One of its primary goals is to allow multiple users to access and share this data simultaneously. By providing a centralized and controlled environment for data storage and retrieval, a database system ensures that users can collaborate and work with the same set of data, promoting data consistency and integrity. This enhances productivity, facilitates data analysis and decision-making, and enables seamless integration of data across different applications and systems.

2. The primary key does not necessarily have to be unique for a given table.

True

False

The statement is false because the primary key in a table must be unique. It is a unique identifier for each record in the table, ensuring that there are no duplicate values in the primary key column. This uniqueness is crucial for maintaining data integrity and allowing efficient data retrieval and updates.

Explanation

The statement is false because the primary key in a table must be unique. It is a unique identifier for each record in the table, ensuring that there are no duplicate values in the primary key column. This uniqueness is crucial for maintaining data integrity and allowing efficient data retrieval and updates.

3. DBMS stores data efficiently with little wasted space

True

False

DBMS (Database Management System) is designed to efficiently store and manage data. It uses various techniques like data compression, indexing, and data normalization to minimize wasted space and optimize storage. By eliminating redundancy and organizing data efficiently, DBMS ensures that the storage space is used effectively, reducing the amount of wasted space. Therefore, the statement "DBMS stores data efficiently with little wasted space" is true.

Explanation

DBMS (Database Management System) is designed to efficiently store and manage data. It uses various techniques like data compression, indexing, and data normalization to minimize wasted space and optimize storage. By eliminating redundancy and organizing data efficiently, DBMS ensures that the storage space is used effectively, reducing the amount of wasted space. Therefore, the statement "DBMS stores data efficiently with little wasted space" is true.

4. Multiple constraints can be included in a single query

True

False

Multiple constraints can be included in a single query to filter and retrieve specific data from a database. These constraints can be applied to different columns or conditions within the query, allowing for more precise and targeted results. By including multiple constraints, it becomes easier to narrow down the data set and retrieve only the desired information. This can be especially useful when working with large databases or when trying to retrieve specific subsets of data based on various criteria.

Explanation

Multiple constraints can be included in a single query to filter and retrieve specific data from a database. These constraints can be applied to different columns or conditions within the query, allowing for more precise and targeted results. By including multiple constraints, it becomes easier to narrow down the data set and retrieve only the desired information. This can be especially useful when working with large databases or when trying to retrieve specific subsets of data based on various criteria.

5. Properties of an object are stored as rows in a table

True

False

The statement "Properties of an object are stored as rows in a table" is false. In a relational database, properties of an object are typically stored as columns in a table, where each row represents a separate instance or record of the object. Each column corresponds to a specific property or attribute, allowing for efficient storage, retrieval, and manipulation of data. Storing properties as rows would not align with the standard database design principles and would lead to inefficient data management.

Explanation

The statement "Properties of an object are stored as rows in a table" is false. In a relational database, properties of an object are typically stored as columns in a table, where each row represents a separate instance or record of the object. Each column corresponds to a specific property or attribute, allowing for efficient storage, retrieval, and manipulation of data. Storing properties as rows would not align with the standard database design principles and would lead to inefficient data management.